18 STRUCTURE OF CERTAIN DIPTEROUS LARV^. 



pressing against the ring of the following segment, all with pits and 

 bristles. On the pleuron of each segment, about where one might 

 expect spiracles, is a minute tubercle, on the penultimate segment 

 rather large. Above, the segments from 5 on are transversely 

 divided into four parts; the second part from in front is narrower 

 than the others. At the tip the anal area is prominent, with the 

 two outwardly projecting spinulose cones rather larger than in the 

 Sarcophaga from Limburger cheese; the upper lip of the stigmal pit 

 has three spinulose cones each side, the outer one the largest, the 

 intermediate one the smallest; the lower lip shows two cones each 

 side as large as the inner of the upper lip, and a median pair smaller 

 and situated back from edge of lip; the stigmal plates have the 

 usual six simple subparallel slits. The penultimate segment shows 

 above a subapical transverse row of small tubercles. 



Sarcophagid C. 



(PLate IV, figs. 70, 77.) 



Head rather deeply emarginate from above. Anterior spiracles 

 with about twelve lobes. Each segment has the usual basal ele- 

 vated, spinulose ring, which is very promment; from the fifth seg- 

 ment on there is on each side the usual apical fusiform, swollen, 

 spinulose area pressing against the ring of the next segment; the 

 rest of the surface of the segments, both above and below, is smooth, 

 or faintly striate; on the venter of each segment are two small indis- 

 tinct, smooth tubercles each side. The anal area is prominent, 

 spinulose, and with the usual two outer spinulose cones; beneath 

 there is a smooth, blackish area, crossed by a furrow, perhaps ordi- 

 narily covered by the anal tubercle. The stigmal pit is about once 

 and a half longer than broad ; its upper lip with three very small 

 cones each side, the intermediate so very minute as to be almost 

 absent; the lower lip has two small cones each side, and a median 

 pair below, and away from the margin. 



Reared from decaying vegetables. 



Sarcophagid D. (From grasshopper, Melanoplus.) 



(Plate IV, figs. 64-66.) 



Body rather stout; second segment seen from above broad, 

 smooth; anterior spiracles short, of about eight lobes. Other seg- 

 ments with a basal, swollen ring, which is covered, but not very 

 closely, with short, acute spinules, stouter than those in some of the 

 other species. Beginning with segment 5 there is the usual fusi- 

 form area pressed against the ring of the next segment, also with 

 the stout spinules; the general surface of all the segments (except 2) 



