266 THE CANADIAN ENTOMOLOGIST. 



Cheeks bearing black bristly hairs or macrochsetae at middle ; males 



without orbital bristles Lhuiceinya Desv. 



Cheeks without black bristly hairs or macrochaetas at middle, with only 

 silky, yellow pile ; males with two pairs of orbital 



bristles Bonnet ia Desv. 



The presence of a delicate yellow pubescence on the parafacials in 

 J5. comta is another character which distinguishes it from the two North 

 American species of LinnceiJiya ; in rubbed specimens, however, this 

 pubescence is sometimes very difficult to discern. In comta the palpi 

 are very small, and often partially covered by the folds of the proboscis so 

 that only their tips are visible. The palpi of hcemorrhoidalis are much 

 larger, and, in comparison with those of comta, quite well developed, while 

 the palpi of the new species described below are somewhat intermediate 

 in development between those of Ju^morrhoidalis and comta. The 

 American species of Linncemya may be readily separated as follows : 



JPostacrostichal bristles in three pairs ; slernopleural bristles three ; thorax 

 and abdomen black, covered with grayish pollen, with darker reflecting 

 ?pots hcemorrhoidalis Fall. 



Postacrostichal bristles in one pair ; sternopleurai bristles four ; thorax 

 and abdomen coal black, polished, very thinly grayish 

 dusted a?ithracina, n. sp. 



L. hcemorrhoidalis is the species referred to in Mr. Coquillett's 

 " Revision," p. 87, under the name picta Meig. The latter species is 

 now considered by European authors to be a synonym of hcemorrhoidalis. 



Limicemya a?ithracijia^ n. sp. 



Thorax, legs and abdomen black, polished, very thinly dusted with 

 whitish pollen, the apical half of the scutellum and a small spot on the 

 side of the second abdominal segment in the male red ; calypteres deep 

 yellow. 



Front in male about two-thirds, in female about five-sixths as wide 

 as the eye, frontal vitta dark brown, thinly dusted with whitish pollen ; 

 face and front black, in the male silvery-gray pollinose, in the female the 

 pollen present on the parafrontals only on a small space above the base of 

 the antennae, and as a narrow strip along the margin of the eye, fading out 

 opposite the apex of the ocellar triangle, remainder of the parafrontals 

 polished black ; frontal bristles descending nearly to the apex of the 

 second antennal segment, only a few fine hairs outside the frontal row in 

 .the male, in the female type three strong orbital bristles on one side, and 



