2 PROCEKDINGS OF THE XATIONAL .MUSEUM vol. 68 



about 9 to 12 flat, toothlike processes on the free niarojin. Setigerous 

 tubercles of body as in figure 14, 



Head scitae and punctures as follows: A2 nearer to A3 than to Al; 

 A2 much nearer to Aa than to Al but often scarcely twice as near; 

 A2 somewhat nearer to Al than to Pa; Aa twice as near to A2 as to 

 Pa or more; Pi decidedly nearer to Adf2 than to Adf 1 ; Pi somewhat 

 above the level of Adf2; Pa, Aa, and A2 not in a straight line; inter- 

 space A2-Aa equalling or slightly less than Pl-Pa; Adf2 much nearer 

 to PI than to P2; Pb about twice as near to P2 as to Pi : Adf2 above 

 the apex of the front; P2, Pi, and Adfl approximately in a straight 

 line; Adfa distinctly neaier to Adf2 than to Adfl; Ol posterior to the 

 line connecting the (tenters of ocelli TV and VJ ; Oa less than the ocellar 

 widtli removed from ocellus VI and nearer to the ocellus than to 

 03; Gl approximately equidistant from S()3 and 03; Ga nearer to 

 Gl than to 03; Gl much nearer to Ga than to S03; Gl minute. 



KKY TO TIJK SPKCIKS 



1. Dorsal aetigennis tubercles (1 and II) on abdominal segments 1, 2, and 8 set 



with the minute spiiuiles with which the skin is clothed. Each mandible 

 usually with a large basal process on the oral face (fig. 9) and with no pro- 

 duced margin along the first ventral rib. Line connecting the bases of 

 setae A3 and ()2 passing through ocellus I near the center (fig. 12). 



virescens Fabricius. 

 Dorsal setigerous tubercles (I and II) oji abdominal segments 1, 2, and 8 

 without spinules. Each mandible with a produced margin along the first 

 ventral rib and without a basal process (fig. 10). Line connecting the bases 

 of setae A3 and 02 passing posterior to ocellus I or tangent to its postero- 

 dorsal margin (fig. 2) 2. 



2. Setigerous tubercles I, II, and III strongly conical and conspicuously large 



on all abdominal segments. Dark submedian arcs of head very broad, 



covering all of the head posteriorly phloxiphaga Grote and Robinson. 



Setigerous tubercles I, II, and III not strongly conical and never conspicu- 

 ously large except on abdominal segments 1, 2, and 8, Dark submedian 

 arcs absent on the head-. obsoleta Fabricius. 



DESCRIPTION OF LARVAl-: 



H ELIOT HIS OBSOLETA Fabricius 



The following distinctive characters of tliis larva may be noted: 



All in^fars after the second. — Dorsal setigerous tubercles (I and II) 

 on abdominal segments 1, 2, and S not set with the spinules with 

 which the skin is clothed, exce])t that rarely there may be a few 

 spinules at the base of the tubercles in adult larvae. Tubercle I on 

 the ahove segments somewhat larger than 11 but not conspicuously 

 so. Tubercles not conspicuously conical. 



Fifth instar larva. — Head 2.2-2.6 mm. broad. 



Adult {sixth instar) larva.— Hend 3.3-3.5 mm. broad. A produced 

 margin along the iirst ventral rib of mandible but no basal process 

 (fig. 10). S])iracles on abdominal segments 1 to 7, 0.222 mm. broad, 



