116 MUSCID^E. 



Genus II. STOMOXYS. 



STOMOXYS, Geoff. Ins. ii. 539 (1764) ; F. ; Schr. F. 3 ; Fal. ; Meig. ; 

 Mcq. ; Zett. Conops p., L. ; Gmel. ; Schr. I. A. Musca p., D. G. 

 Stomoxys et Hamatobia, Desv. ; Mcq. 



Corpus mediocre, opacum, pubescens, vix setosum. Oculi oblongi, 

 nudi, in utroque sexu disjuncti. Proboscis porrecta, gracilis, Itevis, 

 nitens, acuminata, basi geniculata. Thorax sutura transversa. Ab- 

 domen segmentis quatuor, non setosum. 



Body of middle size, dull, pubescent, with very few bristles. Eyes 

 oblong, bare, parted in both sexes. Proboscis porrect, slender, smooth, 

 shining, acuminated, geniculated at the base. Thorax with a transverse 

 suture. Abdomen with four apparent segments, not bristly. 



Some of the species of this genus much resemble M. domestica, 

 but are especially distinguished from Musca by the form of the 

 proboscis, with which they pierce the skin and suck the blood of 

 man and of cattle. 



1. calcitrans, L. Fn. 1900 (1761); Geoff.; F.; Gmel.; Schr.; 

 Fal. ; Meig. ; Mcq. tessellata, F. Nigra, cinereo-tomentosa, capite 

 albo, palpis fulvis, thorace nigro-quadrivittato, abdominis segmentis 

 maculis duabus vittaque dorsali suturisque nigris ; Mas, palpis longis 

 clavatis, alis fuscis; Icem. alis subcinereis, tibiis anticis basi fulvis. 

 Long. 2|-3 ; alar. 5-6 lin. 



Black, with cinereous tomentum. Head white; facialia without 

 bristles; epistoma slightly prominent; palpi tawny. Antennas not 

 reaching the epistoma ; third joint linear, rounded at the tip, full thrice 

 the length of the second ; sixth plumose nearly to the tip. Thorax 

 wich four black stripes ; costal vein ending at a little behind the tip of 

 the wing ; subcostal vein ending at beyond one-third of the length ; 

 mediastinal vein ending at beyond half the length ; radial vein ending 

 at about seven-eighths of the length ; cubital vein very slightly curved ; 

 prsebrachial vein forming a slight curve at its flexure, joining the costal 

 at some distance from the tip of the cubital ; discal transverse vein 

 curved inward in the middle, parted by much less than its length from 

 the flexure of the praebrachial, and by less than half its length from the 

 border. Alula3 grey. Abdomen with two spots on each segment, an 

 interrupted dorsal stripe, and the sutures black. Male. Darker than the 

 female. Palpi long, clavate. Wings brown. Abdomen with the spots 

 larger than those of the female, and the dorsal stripe less interrupted. 

 Fern. Wings slightly grey. Fore tibiae tawny towards the base. 



Generally distributed. (E. S. I.) 



The following additional species of Stomoxys have been recorded 

 as British : 



1. Stomoxys irritans, L. 



2. stimulans, Meig. 



