482 



COLEOPTERA. 



spurs ; tarsi -vvithont claws, joints each with a membranous 

 lobe beneath." The females are sac-like. They live enclosed 

 in the body of the bee. 



In Stylops the antenn.ne are six-jointed, and in Xcnos they 

 are four-jointed. From the middle of May until late in June 

 both sexes of Stylops may be found in "stylopized" individu- 

 als of Andrena and Polistes. Tiie flattened triangular head 

 of the female may be seen projecting from between the abdomi- 

 nal segments of the 1)ee, and sometimes there are two or three 

 of them. On carefull}^ drawing out tlie whole body of a female 



Stylops ChildrGni (Fig. 400 ; o, ab- 

 domen of bee enclosing the female 

 Stylops ; &, top view), Avhich is very 

 jf'' extensible, baggy and full of a thin 

 fluid, and examining it under a high 

 power we found multitudes, at 

 least three hundred, of very minute 

 Stylops larvje, like particles of dust 

 issuing in every direction from the 

 body of the parent. ]Most of them 

 escaped from near the head, over 

 whicli they ran, as they must do, 

 when the parent is in its natural 

 position, in order to get out upon 

 the surface of the bee. It thus ap- 

 pears that the young (Plate 3, fig. 6, 6rt) are hatched within 

 the bod}^ of the parent, and are therefore viviparous. The 

 head of the female is flattened, triangular, nearly equilaterally 

 so, with the apex or region of the mouth obtuse, and the two 

 hinder angles each containing a minute simple eye ; the larger 

 part of the head above consists of the epicraninm, which is 

 narrow in front, with the edge convex ; the mandil)les are 

 obsolete, being two flattened portions lying in front of the 

 gena and separated from that region by a very distinct 

 suture ; no clypeus or lal)rum can be distinguished. The 

 mouth is transverse and opens on the upper side of tlie head, 

 while in front, owing to the position of the mouth, lies the 

 l-ather large labium and the rounded papilliform maxilhe. 

 The larva is elliptical in form, the head semioval, while the 



Fiff. 453. 



