STYLOPID^E. 



483 



Fig. 457. 



tip of the abdomen is truncate ; the sides of the body arc 

 straight, there being no well denned sutures between the seg- 

 ments ; seen laterally the larva is thickest at the metathoracic 

 ring. Two simple eyes are situated near the base of the head. 

 The body is so transparent that the intestine can be traced 

 easily to just before the tip, where it ends in a cul de sac. The 

 two anterior pairs of legs 

 are much alike ; coxae 

 short ; femora and tibiae 

 small, cylindrical ; a slen- 

 der tibial spur ; the tarsi 

 consisting of a single 

 clavate joint equalling 

 the tibia in length, being 

 much swollen at the tip, 

 and without claw r s. The 

 hind tarsi are longer, 

 very slender, two-jointed, the terminal one being bulbous. The 

 terminal styles, inserted in the tenth abdominal ring, are a little 

 more than one-half the length of the body, which is covered 

 with long setose scales. In their movements these infinitesi- 

 mal larvae were very active, as they scrambled over the body 

 of the parent, holding their caudal setae nearly erect. 



On the last of April we caught a male Stylops Childreni West- 

 wood (Fig. 457, and 458) in the same net with a stylopized 

 Andrena placida, and as the abdo- 

 men of the male was long and very 

 extensile, its tip being provided with 

 a capacious forceps for seizing the 

 body of the female, it is most proba- 

 ble that the female described belonged to the same species, and 

 that at this time the short-lived male, for this one lived but for 

 a day in confinement after capture, unites sexually with the 

 female. It appears then that the larvae are hatched during 

 the middle or last of June, from the eggs fertilized in April, 

 and which are retained within the body of the parent. The 

 larvae then crawl on to the body of bees and penetrate within 

 the abdomen of those that are to hibernate, and live there 

 through the winter. The entire body of the male is, Avith the 



