290 Mr. E. E. Austen on new 



second and third segments, by the fourth al)dorainal segment 

 in the ^ being always without a pair of dorsal spots, and by 

 the first longitudinal vein being either entirely bare or 

 having at most one or two minute bristles, instead of a row of 

 bristles conspicuous under a strong lens when viewed at a 

 low angle from the direction of the hind margin of the wing. 



Bdellolarynx *, gen. nov. 



S7nall, stoutly built, thick-set flies, closely allied to Hsema- 

 tobia, Rob.-Desv., but distinguishable as follows : — No sexual 

 colour-dimorphism {unless it be in wings) ; front, facial angles, 

 and anterior margin of bvccal cavity less prominent ; jotvls 

 descending considerably behind, instead of nearly horizontal, 

 bid basi-occipital region much less protuberant ; bristles below 

 facial angles small and fine, instead of relatively coarse ; in ^ , 

 front wider, with vppjer inner margins of eyes more nearly 

 parallel, less apjjroxitnate in middle of front ; arista f leathered 

 above with considerably longer hairs, and below with about six 

 fairly long hairs ; first and third longitudinal veins entirely 

 tare, ivitJtout bristles at base. 



Head: paljji spatulate at tips; proboscis as in Hamatobia, 

 slightly tapering, proximal two-thirds son)ewhat thickened. 

 Tlioracic bristles: — Humeral, 2. Post-humeral, 1. Noto- 

 pleural, 2. Prasutural, 1. Svpra-alar, 1. Intra-alar, ]. 

 Post-alar, 2. Dorso-ceiUral, 5 (2 in front of and 3 behind 

 suture^may be difficult to distinguisrh, especially in ? ). 

 Inner dorso-centrnl , 1 (sometimes 2 in J ). Scutellar, 4 

 (1 prsebasal, 1 basal, 1 di^cal — situated close to lateral mar- 

 gin, 1 apical). Mesopleural, about 10 or 12. Sterno- 

 pleural, 1:1. 



Wings : shape of first posterior cell similar to that of 

 same cell in wing of Hamatobia, but bend of terminal portion 

 of fourth longitudinal vein somewhat flatter and less abrupt. 



Bdellolarynx is distinguished from Hmnatobosca, Bezzi, by 

 the palpi being much more spatulate at the tips, by the arista 

 having a greater number of hairs below, and, in the wing, 

 by the shape of the fir>.t posterior cell and the course of the 

 terminal portion of the fourth longitudinal vein (in Hamato- 

 bosca the latter details are the same as in Stygeromyia, 

 Austen). 



Typical species, Bdellolarynx sanguinolentus , sp. u. 



Bdellolarynx sanguinolentus, sp. n. 

 S ? . — Length, S (3 specimens) 4*75 to 5 mm., ? (4 

 * 6 fSSeXXo-Xa/jty^, leech-throat, a name applied to a greedy parasite. 



