PLATE D. 



Fig. 1. — Head of a Deltocephalus^ with the black 

 shining purse attached, within which is formed the 

 larva of Gonatopus pilosus. Here the sac is seen 

 adhering to the insect close behind the eye. 



Fig. 2. — Under side of the abdomen of an Athysanus, 

 with a similar sac, showing its attachment between 

 the body-rings of the insect. The suture is turned 

 towards an observer. 



Fig. 3. — The sac detached from the insect, with its 

 two valve-like sides. 



Fig. 4. — Part of the sac torn asunder, showing at m 

 its membranous character, and the singular black 

 fibres which run through its substance, giving it 

 somewhat of a ringed appearance. 



Fig. 5. — Kepresentation of the maggot which has 

 been extruded from one of the black sacs, a split 

 being made down the suture. 



Fig. 6. — Head and prothoracic ring of the same 

 maggot, much magnified. 



Fig. 7. — The imago, having an ant-like appearance, 

 which has been developed from the cocoon spun by the 

 aforesaid larva, and bred in confinement. The singular 

 character of the fore legs, with the remarkable 

 development of their tarsi, is well shown : p represents 

 the femur, and u the shear -like prehensile organ 

 expanded. 



Fig. 8. — A similar insect seen in profile, with three 

 only of the legs and one antenna. The clasping 

 apparatus is marked at u. 



Fig. 9. — Front leg, with its trochanter, coxa, femur 

 at p, tibia at r, and first joint of the tarsus at p. At v 

 the hinge is represented, upon which the sword-like 

 claw, w, turns ; and it is clasped against the opposite 

 claw-like process at u. 



Figs. 5, 6, 7, 8, and 9 are engraved after Prof. Mik's 

 drawings. 



