Genus and Species of Muscitloe. 417 



of tliat exhibited by the first posterior cell in the case of 

 Stovioxys calci'tranSj L. ; apical portion of fourth vein beyond 

 the bend perfectly straight^ not bent inwards at the extremity, 

 as in Stonioxys and //(eniatobia. 



Typical species, IStyyeromyia maculosa, sp. n. 



Stygeromyia maculosa^ sp. n. 



c? . Length 6| mm. ; length of wing 6^ mm. ; width of 

 head '2\ mm.; widtii of front at narrowest part ^ mm., slightly 

 wider at vertex ; lengtii of proboscis from base of chitinous 

 portion to tip of labella 1^ mm.; width of tliorax at trans- 

 verse suture '2\ mm. ; width of abdomen at hind margin of 

 second segment 2| mm. 



Entirely smokr-yrey *, striped and spotted loith brown, 

 bristles and hair entirely black; palpi and tibice oranye-bu^ 

 (anterior surface of hind tibioe suft'used with grey) ; winys 

 hyaline, basal portion of third vein with some 7 or 8 bristles, 

 wide apart and exceedingly minute. 



Head. — Face ^\\i\ front yellowish silvery, posterior surface 

 grey; ground-colour of face ochraceous; frontal stripe 

 walnut-brown, narrow, slightly narrower than orbits in middle, 

 expanding above and below, lower extremity enclosing usual 

 silvery spot above base of antennas ; anteyince, first and second 

 joints and base of third joint on inner side below orange- 

 rufous, remainder of third joint and arista dark brown ; hairs 

 on U|)|)er side of arista long, 11 or 12 in number ; palpi s\\{\\ 

 short black bristles on outer side on distal two-thirds, three 

 or four bristles at extreme tip of each palpus longer than 

 remainder,and very conspicuous when insect is examined under 

 a lens ; middle portion of lower margin of each palpus beset 

 with a series of fine and rather long black hairs ; proboscis 

 dark chestnut-brown. Thorax. — Brown markings on dorsum 

 as follows : — a pair of narrow adniediaa stripes extending 

 from anterior margin across transverse suture and terminating 

 at one-fourth the distance between suture and pr^escutellar 

 furrow ; a somewhat liyhter-coloured median stripe, which, 

 commencing a short distance in front of the inner dorso-central 

 bristles, disa{)[)ear3 close to hind margni, and reappears again 

 as -A faintly marked Jicck on base of scateUum ; two broadtr 

 spots on each side near transverse suture, one in front of 

 suture, immediately behind post-humeral bristle, the other 

 behind suture, between supra-alar bristle and the dorso-central 

 row, and nearer to the latter; the last-mentioned spot is 



* For uamea of colours see Ridgway, ' A Nomenclature of Colors for 

 Naturalists ' (lioston : Little, Brown, and Company, 1880). 



