]54 



[■July, 



each somewhat like a missliapen ('. These are presnniablv the peri- 

 iremrn,* which in the last larval stage surrounded the actual stigmatic 

 (irifii-L's. Jn eacli of the species here dealt with the uppermost C faces 

 downwai'ds, and the two others lie one hehind the other, facing in the 

 reverse direction. The external scar is a small rounded depression on 

 tlie imier side of each posterior stigmatic plate near its margin ; it indi- 

 cates the ])()int where the tracheal apparatus of the penultimate lai-val 

 stage c;ime out, when this stage moulted to the last larval stage. t In 

 tile thr^^'c forms descrihed helow the posterior stigmatic ))lates are 



Fijj. 1. — Dorsal aspect of puparium : a, of Coelopa pilipes; b, oi Fucomyla gravia. 

 Both X 12. a.sp., anterior spiracles; p.sp., posterior spiracles (of last 

 larval stage, persisting in puparium). Both puparia show the irregular 

 hole made by the emerging Aleochara. 



encircled at their margins, except in the region of the external scar, 

 with a fringe of branched or plumose hairs. Hairs both sim])le and 

 hi-anched are figured by Keilin X in the posterior stigmatic plates of 

 certain Anthomyiidae, but in these cases they are situated in little 



* Henneguy, " Lea Inaectes " (1904), p, 101. 



t i). Keilin, " Recherches sur lea larvea de Dipteres Cyelorhaphes," Bull. Sci. France et 

 Belgique, 49, p. 79, 191.'i. 



I D. Keiliu, "Recherches sur les Anthomvides a lar^es carnivores," Paraaitology, 9, 1917: 

 Phaoiiia cincta, pi. xi, fig. 42; Pkaonia keilini, flg. ixii, A, p. i!80; Mydaea pertusa, tig. xxvii, C, 

 p. iil»4 ; Muscina assimilis, fig. xxxvii, B, p. 411. 



