Malayan Membracidae
W.D. Funkhouser, writing from the Entomological Laboratory of Cornell University, published this taxonomic monograph in 1918 describing a collection of treehoppers (family Membracidae) gathered by Professor C.F. Baker at Singapore and Penang during the summer of 1917. The paper establishes twelve new species and provides distributional records for previously described taxa, significantly extending knowledge of the Indian homopterous fauna in the Malay Peninsula.
Summary
Funkhouser’s paper is a straightforward species-level treatment of a single collector’s series, organized as a numbered list of twenty-seven entries. Each entry provides either a full morphological description (for new species) or a brief record with synonymy and locality data (for known species). The collection spans two localities—Singapore and the Island of Penang—and includes both sexes where available, with type specimens deposited in the author’s collection and paratypes in Professor Baker’s collection at Los Banos.
The taxonomic work is notable for its introduction of a new genus, Centruchus, erected on the basis of unarmed hind trochanters as a distinguishing character separating it from the otherwise very similar Tricentrus (p. 9). The genus Gargara is the most heavily represented, with five new species described from this material alone (G. projecta, G. penangi, G. triangulata, G. nervosa, G. sordida), suggesting the genus was particularly diverse in the region. The new species Xiphistes orientalis is distinguished by its heavy, blunt suprahumeral horns and largely exposed scutellum, while Anchonoides variegatus is characterized by a strongly sinuate posterior process with two distinct elevations and a four-banded tegminal coloration pattern (pp. 1, 4).
The paper also contributes to nomenclatural clarification, notably resolving the identity of Sipylus dilatatus Walker with Funkhouser’s own earlier Sipylus nodipennis (p. 5), and noting that Walker’s second Centrotus gibbosulus (1868) had been elevated by Distant to the genus Mauria (p. 6).
Key Findings
- Twelve new species are recognized from the Baker collection, eleven fully described and one (Periaman sp.) left undescribed due to specimen damage (p. 14).
- A new genus, Centruchus, is proposed with C. laticornis as type, separated from Tricentrus by the absence of teeth on the hind trochanters (p. 9).
- The genus Gargara yields five new species from this single collection, the largest contribution to any one genus in the paper (pp. 10–14).
- Gargara projecta is distinguished by an unusual head orientation—projected forward rather than deflexed or vertical as in most Membracidae—described from six specimens across both localities (p. 10).
- Tricentrus gibbosulus Walker is recorded from six specimens (three males from Singapore, two males and one female from Penang), with a note on the homonymy involving Walker’s 1868 species (p. 6).
- Gargara nitidipennis Funkhouser, previously known only from the Philippine Islands, is confirmed for the Malay Peninsula with no specific characters separating the two populations (p. 10).
Conclusion
Funkhouser’s paper demonstrates that the Malay Peninsula harbors a rich and previously underdocumented fauna of Membracidae, with the majority of species in the Baker collection representing new science. The work anchors the biogeographic connection between the Indian, Philippine, and Malay treehopper faunas, and the erection of Centruchus as a distinct genus reflects Funkhouser’s ongoing effort to refine generic boundaries within the family using subtle morphological characters such as trochanteral armature.
Context
- The collection was made by Professor C.F. Baker, Dean of the College of Agriculture at Los Banos, Philippine Islands, who facilitated Funkhouser’s access to the material (p. 1).
- The paper was contributed from the Entomological Laboratory of Cornell University, reflecting the trans-Pacific entomological networks linking American universities with colonial-era field collections in Southeast Asia.