232 [August, 



abdomen having large, recui'ved, enbglobose anal segments ;* the antennae are rather 

 short and black ; the palpi are filiform and black ; the frontalia are wide, the eyes 

 of the male being more widely separated than in any other species ; the thorax is 

 marked with four indistinct black stripes, and has three outer dorso-central bristles 

 behind the suture ; the tip of the scutellum is red ; the abdomen is of a bright shiny 

 black colour, with the vestiges only of white interrupted bands ; the wings have 

 very short cubital appendices. N. setosa, Mcq.,t seems closely to resemble this 

 species in form and colour, only differing by having the palpi yellow instead of 

 black, and having no appendices to the wings, it is probably only a variety of the 

 same. Very rare ; I have only seen two examples (both males), which I obtained 

 with other unnamed British species from the late F. Walker. 



[263] 16.— CHETOLYGA, End. 



Oct., 1891. Nemoe^a, pt. Mgn., Mcq., Schn. 



Oen. ch. — Eyes hairy, more or less approximated in the males, 

 and prolonged to near the bottom of the sides of the head and face ; 

 antennae drooping, second joint elongated, and more than half the 

 length of the third ; cheeks hairy ; chin short ; facialia nearly or quite 

 bare ; abdomen without discal setae on the middle segments ; hind 

 tarsi of females not dilated. 



1 (2) Anal segments black 1. amcena, Mga. 



2 (1) Anal segments red. 



3 (6) Thorax with five stripes. 



4 (5) Antennae with third joint widened, and second abdominal segment with four 



marginal dorsal bristles 2. analis, Mcq. 



6 (4) Antennae with third joint narrow, and second abdominal segment with only 



two bristles 3. nigrithorax. Egg. 



6 (3) Thorax with four stripes 4. quadripustulata,¥. 



C. AM^NA, Mgn. 



If. exacta, Wlk. 

 Eyes of male approximated ; antennae black, with the third joint rufous at the 

 base, and about one and a half times as long as the second ; cheeks thinly clothed 

 with fine black hairs ; palpi red ; thorax black, thickly coated on front and sides 

 with white pubescence, and marked upon the dorsum with five distinct longitudinal 

 striae ; also having four external dorso-central bristles behind the transverse groove ; 

 scutellum rufous ; abdomen black, with sides red in the male, and marked in both 

 sexes with broad tessellated irregular white bands ; anal segments black ; legs black, 

 tibia sometimes piceous. Rare ; found by Mr. Harwood, of Colchester, who kindly 

 sent me a female ; it is also in Mr. Verrall's collection, who possesses the typical 

 specimen named N. exacta by Walker. 



C. ANALIS, Mcq. 



cruentata ?, End. 

 Eyes sub-approximate in the males, and not very widely separated in the 



* The shape of the abdomen is very similar to that of Cynomyia mortuorutn. 

 t Ann. d. 1. Soc. Ent. do Fr., 11, 6, 116. 



