320 BRITISH SPECIES OF THE 



the 1 st joint of the hind feet is less dilated than in No. 4, the 

 wings shorter : abdomen attenuate behind : thorax generally without 

 impressed lines, but is more irregularly and thinly shagreened 

 about the middle than elsewhere. (Length 1 ; wings 2 lines.) 



I find it commonly on deliquescent cucumbers. Mr. F. 

 Walker also takes it near London. 



Sp. 4. Sph. denticulata. Capite thoraceque nigris ; femo- 



ribus posticis maris parum incrassatis. 

 Borborus denticulatus . Meig. VI. 200. No. 3. 

 Sphaerocera denticulatus. Macq. S. a B. II. 565. No. 2. 

 Coprina bovina . . . Rob. D. 810. No. 1. 



Dull black : arista blackish : thorax and scutel shagreened and set 

 with minute points, the former with two impressed smooth lines, 

 the margin of the latter with a number of sharp teeth : abdomen, 

 in the female particularly, broader than the thorax ; the 2d, 3d, and 

 4th segments nearly equal, 5th small : coxae and knees brown ; or 

 the legs are testaceous, with the feet and the end of the shanks 

 dusky in the fore pair. Hind thighs of female slender, a little 

 thickened in male : poisers whitish : wings hyaline, with brownish 

 nerves ; or of a dusky tinge, with the costal nerve blackish. 

 (Length 1| ; wings 2| lines, or less.) 

 In the same localities with the 1st species, but much less 



abundant. 



Sp. 5. Sph. scabricula. Brunnea, abdomine nigro. 



Head and thorax chestnut-brown, opaque, very thickly shagreened, 

 and set with minute white points, lying flat : head very long : eyes 

 small : arista whitish : teeth of the scutel very sharp, decurved : 

 abdomen black : legs short, set with very minute whitish bristles, 

 light brown, with the knees and feet paler : hind thighs of the 

 male not thickened : feet very short ; 1 st joint of the hind pair as 

 long as the next three together : wings whitish hyaline, with pale 

 ferruginous nerves ; the costal brown : they are shorter than in 

 No. 4, and the rib is finely ciliate. (Length § ; wings H line.) 

 Found near London, by Mr. Walker. 



Gen. II. — Borborus. 



Arista pubescens, quasi exarticulata. Frons et scutellum 

 setigera. Areola analis completa. Nervus transversus 

 ordinaries alee margini proximus. 



