1918.] 173 



NOTES ON THE DERBIDAE IN THE BRITISH MUSEUM 

 COLLECTION.— I. ZORAIDINAE. 



BY FEEDERICK ilUIE, F.E.S. 



Elsewhere* I have made tentative and partial attempts to classify 

 the Derhidae, based upon Oriental and Malayan forms. Through the 

 courtesy of the authorities of the Biitish Museum and the Imperial 

 Bureau of Entomology, I have been able to examine a number of genei*a 

 and species hitherto unknown to me, except through inadequate descrip- 

 tions, among them species from Africa and South America. This has 

 enabled me to correct some errors in my former work, and to commence 

 the preparation of a more satisfactory classification of the genera of the 

 family. The following is a list of genera of the Zoraidinne, followed 

 by a list of species of that subfamily in the British Museum collection, 

 and some remarks and descriptions of new species and genera. 



ZoiiAIDINAE. 



TegmiDa long and narrow ; -wings very small or not more than half the 

 length of the tegmina, narrow, costal and posterior margins subparallel or con- 

 verging to a pointed apex, the cubital ani claval areas greatly reduced with 

 the cubital and claval veins missing or greatly reduced, the posterior basal area 

 proportionally large and corrugated and used as a stridulating organ ; shoulder 

 keels and subantennal processes absent or very small. [Zoraidinae.) 



List of Genera. 



a}. Eyes in front not reaching to the base of clypeus ; subcostal cell long, some- 

 times very narrow (ZoRAiDiNr). 



h^. Antennae shorter than face, ovate, clavate or subclavate, arista apical; 

 lto3 cubital veins reaching the hind margin ; female genital styles 

 abortive. 

 c^. None of the median sectors furcate. 



d^. Head as wide as thorax or wider Diospolis. 



d^. Head narrower than thorax. 



e\ Basal median cell narrow; wings about half the length of the 



tegmina, apex rounded Proutista. 



e^. Basal median cell broad ; wings considerably less than half 

 the length of tegmina, apex acute. 

 /\ Mesonotum with three distinct carinae. 



Camma. 



/-. Mesonotum without carinae, or carinae very indistinct. 



DlOSTROMBUS. 



c^. Third median sector, sometimes apparently the second, furcate. 

 (/^. Face in profile round, not greatly produced between the eyes. 



Pamendanga. 



^^ Face in profile conically produced Helcita. 



* Hawaiian Sugar Planters' Experiment Station, Entomological Bull. 12 (1913) : Philippine 

 Journ. Sci. D, xii. 2, pp. 49-104 (1917). ' v / » f f 



