ARABTHROPEAS. 109 



base, 4th closed distinctly before wing-margin ; posterior cross- 

 vein present ; anal cell closed. 



c? unknown. 



Range. Assam. 



This genus differs from Arthropeas, L\v., by (1) the 1st flagellar 

 joint not being differentiated from the others, except that it is 

 longer, and the whole antennae boing practically cylindrical 

 throughout instead of gradually narrowing to tip ; (2) the abdo- 

 men being much narrower and longer relatively to the thorax ; 

 (3) the 4th posterior cell being distinctly closed before the border.; 

 and (4) the hind femora being distinctly incrassated and bearing 

 a row of small blunt spines on the underside. 



Williston, in his table of genera of North-American LEPTID.E, 

 emphasizes the absence of contact of the 5th posterior cell with 

 the discal cell, but in Loew's figure of the genotype such contact 

 is only punctiform. These cells may be more separated in the 

 other two North-American species ; they are distinctly apart in 

 Pararthropeas. 



72. Pararthropeas thereviformis, sp. nov. (PI. II, figs. 5, 6.) 



$ . Head as broad as thorax ; eyes bare, black, facets small, of 

 uniform size ; frons about one-seventh of the head, almost flush 

 with eyes, blackish, with short pale pubescence, which is a little 

 thicker just above antennae ; face not projecting beyond eyes, 

 flattened, with nearly parallel sides, dark grey, practically bare ; 

 occiput blackish, bare, except for some short whitish pubescence 

 behind lower margin of eyes. Proboscis short, thick, not pro- 

 jecting beyond base of antennae, brown, bearing a few hairs ; palpi 

 as long as proboscis, bare, brownish yellow. Antennae longer 

 than breadth of head, cylindrical ; 1st and 2nd joints black, 

 bristly, 2nd shorter than 1st, as broad as long ; 3rd bare, divided 

 by seven impressed lines into eight anuulations, of which the 1st 

 is the longest, tip bluntly pointed; 3rd joint black, except the 

 brownish-yelloxv 1st annulation and base of 2nd. Thorax oblong; 

 dorsutn black, rather flattened, with microscopic, depressed, grey- 

 ish pubescence, which is a little more obvious in front of the 

 scutellum ; the latter black, with centre and hind margin yellowish, 

 sparsely and shortly pubescent ; humeri prominent, yellowish 

 brown ; pleurae black, with very short grey pubescence. Abdomen 

 subcylindrical, nearly Phycus-like, 7-segmeuted, the first six 

 subequal, the last very short; black, with minute grey pubescence, 

 hind margins of segments yellow ; genitalia ending in two small 

 cylindrical yellowish pieces, which are all that is externally 

 visible. Legs Therevid-like, comparatively stout and strong ; coxae 

 black, with minute grey pubescence; fore femora brownish yellow, 

 with upper side and distal half of lower sides black ; middle pair 

 black, except narrowly at base and tips ; hind pair black, with a 

 broad yellow band just before middle ; tibiae black, except that 

 anterior pairs are very narrowly brownish yellow at base and tips ; 

 front tarsi distinctly longer than tibiae, posterior pairs subequal to 



