C1LVSMOA1MA. 103 



hind tibia} arched, much shorter than the femora ; tarsi simple. 

 Wings with the marginal cell broadly open ; tlu third vein with a 

 deep but broad kink, exactly as in Tropidia fasciata ; middle cross- 

 vein just above the middle of the discal cell; vena spuria strong, 

 but not entirely chitinised ; distal extremity of first posterior cell 

 shaped as in Xylota ; lower corner of the discal cell rounded and 

 without an appendix ; all the veins bare. 

 Type : the following new species. 



110. Chasmomina femoratum, sp. n. - 



3 $ . Length of the body 7-8 mm. 



An interesting insect, strongly resembling Xylota femorata, L., 

 but less than half its size. 



Head shining aeneous black, the occiput and trons in both sexes 

 as far as the middle velvet v black and dull ; face with a faint white 



Fig. 16. Cliajmomma feinomtnm, sp. n. 9. X 4}. 



pollen, but the median tubercle shining black ; frons and sides of 

 face bearing very thin and rather long greyish hairs ; occipital 

 border narrowly argenteous behind ; antenna? black, brownish 

 towards the base. Thorax wholly black, somewhat shining, with 

 whitish pollen at the sides, on the humeri, and along the transverse 

 suture ; the back is almost bare ; pleura partly whitish pollinose, 

 with rather short pale hair. Sqnanmlae small, white ; halteres 

 whitish. Abdomen bluish black, shining, with the following dull 

 black markings : a rounded spot or. each side of the first segment; 

 second segment with a median longitudinal band, dilated into a 

 transverse band in front and behind, the posterior band being some- 

 what removed from the hind border; third and fourth segments 

 with a similar pattern, which is, however, less distinct especially on 

 the fourth ; these patterns arc more clearly defined and broader in 



