Dec, 1922.] JOHANNSEN : StRATIOMYIID LaRV.^. 145 



HHH. Body usually with two indistinct, pale, irregu- 

 lar, longitudinal stripes, head slightly wider than 

 long ; anterior angle of eye tubercle strongly re- 

 entrant (fig. 29) ; length 9 mm cuprarius. 



EE. Eye tubercle not prominent except in Hermetia ; body cov- 

 ered with more or less appressed scale-like hairs, except in 

 Neopachygaster (fig. 8). 

 F. Body bristles slightly clavate ; terminal abdominal seg- 

 ment slightly cleft ; body usually striped, sometimes but 

 faintly. Penultimate instar (fig. 23). Microchrysa polita. 

 FF. Not as above. 



G. Head with stellate hairs (fig. 32). Penultimate instar. 



Geosargus A. 

 GG. Head without stellate hairs. 



H. Head only slightly longer than broad ; antennae sit- 

 uated distinctly proximad of the latero-anterior angle 

 of the head. Penultimate instar. (fig. 35). 



Geosargus B. 

 HH. Head noticeably longer than broad. 



/. Eye tubercles distinct ; antennae situated distinctly 

 proximad of the latero-anterior angles of the 

 head ; posterior margin of last abdominal seg- 

 ment slightly emarginate (figs. 2,^. 3Q~'- 



Hermetia illucens. 

 //. Eye tubercles less distinct. 



/. Antennae situated at the apex of the latero- 

 anterior angles of the head (penultimate instar 

 of Hermetia? Fig. 36). Stratiomyiid II. 

 //. Antennae situated proximad of the latero- 

 anterior angles of the head. 

 K. Body with more or less appressed scale- 

 like hairs and short bristles ; head bristles 

 short (fig. 31). Penultimate instar. 



Macrosargus clavis. 



KK. Body without appressed scale-like hairs. 



bristles stout, almost clavate (fig. 8a) ; the 



longer head bristles half as long as the 



diameter of the head. 



Neopachygaster maculicornis. 

 KKK. Body without appressed scale-like 

 hairs ; differs from the foregoing in having 

 on the disc of segments one and two a large 

 transverse chitin plate instead of numerous 

 small oval plates. . . Xylomyia pallipes. 



