DERBIN^. 295 



Subfamily VII. DERBINJE. 



Derbida, Sm, Hem. Afr. iv, pp. 130 & 192 (1866). 



Derbina, Stal, Ofv. Vet.-Ak. Fork. 1870, p. 750 ; Atkins. J. A. S. 



Bencj. Iv, p. 41 (1886). 

 Derbidfe, Mdich. Horn. Faun. Ceylon, p. 11 (190-3). 



Head (including eyes) generally narrower than the pronotum ; 

 clypeus with the lateral margins sometimes carinate ; apical joint 

 of rostrum either short or minute ; pronotum posteriorly angularly 

 emarginate ; clavus usually as in AcJiilince ; posterior tibiae seldom 

 spinose ; basal joint of posterior tarsi elongate. 



These extremely fragile insects are of a homogenous character 

 and the subfamily is easily recognizable ; the usually narrow 

 vertex and face and the short apical joint of the rostrum are 

 characters which may be relied on, while the genex*a are well 

 marked and readily separated. Although in some genera con- 

 siderable aberrance in form from other subfamilies of the Fulgoridse 

 is apparent, Stal evidently exhibited his usual insight in placing 

 the Derhino' where he did, and I follow his arrangement. 



Synopsis of Genera *. 



A. Aiiteiiufe of ordinary or moderate length, not 

 abnormally developed. 



a. Wings not more, or sometimes less, than half 



the length of tegmina. 



a. Mesonotuni tricarinate. 



a' . Second joint of autennte only a little 

 longer than head. 

 a^. Face rounded, but not angularly, 

 laminately projecting. 



a^. Olypeus longer than face Phenice, p. 296. 



6^. Clypeus shorter than face Pamendanga,p.298. 



b". Face angularly, laminately projecting. Jada, p. 299. 

 b' . Second joint of antenme about as long 



as head and thorax together Zoraida, p. 300. 



b. Mesonotum smooth, non-carinate Drona, p. 305. 



b. Wings moderately ample, considerably more 



than half the length of tegmina. 



a. Head longiy produced in front of ej-es. 



a . Head not compressed and laminately 



produced beneath Intekamma, p. 306. 



b' . Head compressed and strongly lami- 

 nately produced beneath Vivaha, p. 307. 



b. Head not, or only slightly, produced in 



front of eyes. 

 a'. Costal membrane of tegmina distinctly 

 arched and dilated. 



* Beyond the synoptical characters liei'e given, the structural characters of 

 the face as delineated in the figures representing each genus may be studied 

 with advantage. 



