HEMIGASTER. ABTHULA. 37 



onychii, black ; hind legs black, with the coxa;, trochanters, and 

 base (or in tf underside) of the femora rufescent, the apical third 

 of the densely setit'erous tibise and the tarsi, except their onychii, 

 stramineous, or in <3 testaceous ; calcaria slightly longer than halt' 

 the spinose metatarsi ; third tarsal joint double the size of the 

 fourth; claws curved and simple. Wings clear hyaline through- 

 out ; stigma fulvidous, nervures and J stigma darker ; cubital 

 nervure basal ly oblique, nervelet distinct. 



Length 8 millim. 



ASSAM : Khasi Hills (Rotlmey). 



Types tf % in the British Museum. 



This species is remarkable for the strongly curved median 

 nervure of the hind wings and the Cryptoid basal abdominal 

 segment. 



Genus ARTHULA, Cam. 

 Arthula, Cameron, Manch. Mem. 1900, p. 110. 

 GENOTYPE, A. brunneocornis, Cam. 



J only. Head not strongly buccate behind the large and 

 internally parallel eyes, which do not extend to the base of the 

 stout, short, and equally bidentate mandibles ; clypeus small, 

 separated from the face and obliquelv impressed transversely at 

 the apex ; labrum prominent and rounded. Antennae stout, of 

 29 joints, and but little attenuate apically. Notauli distinct and 

 reaching centre ; metanotum with a single transverse carina near 

 the base, its spiracles linear, somewhat large and rounded at both 

 extremities. Scutellurn large and convex. Basal segment curved 

 and gradually subexplanate apically, with spiracles shortly beyond 

 the centre; second segment triangular, basally narrow and 

 gradually explanate to the transverse apex, with indistinct 

 gastrocoeli ; the third to fifth segments broader than long, and 

 with large lateral impressions, their centres being roundly 

 elevated ; hypopygium large, flat and apically triangular. Legs 

 elongate, hind coxae large, with the basal joint of their trochanters 

 longer than twice the apical ; tarsi spinose, with the metatarsi 

 longer than the remaining joints; front tibiae with no calcaria. 

 Wings with no areolet, and the single submarginal nervure so 

 abbreviated that the cubital and radial nervures almost coalesce ; 

 fenestrae distinct ; discoidal nervure obliquely curved on the basal 

 half. 



Range. Assam. 



"The short thick antennae with comparatively few joints" (says 

 Cameron, loc. cit.) "and the similarity in the alar neuration, might 

 place it near Accenitus, In the absence of the $ > its exact 

 relationship cannot be very clearly denned. It comes nearest to 

 the TKYPHONIDES and is closely related to Chreusa, Hemigaster, 

 and Macroyaster, with which it agrees in the neuration of the 

 wings and in the paucity of joints in the antennas, but may be 

 known from all of them by the median segment having only one 



