of the StylopidcB and their puparia. 1 97 



the outer or upper region, each furnished with a minute 

 central dot ; in front of which are two projecting auricles (Z»), 

 situated on either side of the labrum (e), having an inter- 

 vening transparent space (the original larval mouth); 

 followed by a longitudinal central elevation terminating 

 in an abrupt notched declivity (the frontal region ?) (rf) ; 

 all these being encompassed by an oblique facial belt, 

 commencing below the notch and extending backwards on 

 either side to the posterior margin of the head-cap above. 



Beyond the notch, and outside this belt, are two other 

 circular glossy discs (c), somewhat larger and farther 

 apart than the first-mentioned pair, having in like manner 

 a central dot, apparently indicating the position of the 

 antennaB in the imago, whose eye-shades, more or less 

 studded with faint traces of the detachment of the facets, 

 are conspicuous on either side of the head-cap. 



As regards the parasite nurtured by the Epora, the 

 female of this Stylopite would necessarily assume the same 

 position as others when perforating between the abdominal 

 segments ; and it would seem reasonable to infer that the 

 adult-larva of the male should in like manner correspond 

 therewith, as witnessed in other instances, the analogies 

 in the head-cap being thus presumably reversed as com- 

 pared with the imago. 



Oxford, 5th June, 1877. 



My dear Sir Sidney,— Herewith I return your paper 

 on the larvfe and puparia of the Stylopidce, with a set of 

 drawings which I have made from your preparations, in 

 order to illustrate your observations. 



These drawings (Plate VI.) represent — 



Fig. 1. The adult male Stijlops Mathin the puparium, which exhibits the 

 two prominent auricles (J)h) and the nasus-like front of the 

 head-case {d). 



Fig. 2. The full-grown larva of the male Stylops in situ, with the terminal 

 segments of the Andrcna within which it has been reared. 

 This figure shews that the very convex portion of the surface of 

 the head of the larva is in contact below with the dorsal portion 

 of the abdominal segment of the Andrena ; it also shews tlie 

 projecting auricles {hh), the nasal prominence or notched de- 

 clivity (d), and one of each of the two ]iairs of ocelli-like 

 discs (« and r) ; together with three of the six (podal) 

 circlets (y l,/2,/;5) upon what is here the dorsal surface of the 

 segments following the head; also two of the oval iiolishcd 

 spaces below the aforesaid (.f and y); and one of the lateral 

 spiracles (z). 



