1900] 



ENTOMOLOGICAL SOCIETY. 



77 



Fig. 38.— The head of the squash bug showing the antennae (a), the eyes (b), the 4-jointed beak'(c), the 

 four lances (d) and (e), and the labrum (f), (Original.) 



The two large compound eyes situated behind the foot of the antennae are very 

 similar to those of the cabbage butterfly, described and illustrated in last year's Report. 

 In addition to the two compound eyes two simple eyes or ocelli may be seen with the aid 

 of a magnifying glass between the large eyes. They look like minute glass beads. 



If the under side of the head be 

 examined a slender beak-like organ 

 can be seen extending from the head 

 backwards beyond the second pair of 



legs, (Figs 38 and 39), and a magnify- R^^ ^p*''A C 



ing glass will show that this beak-like £/ ^m^W % 



organ is a 4-jointed sheath, slit along ^ jW'^ 



one side. With the aid of a needle '^^ f :-M i ^ 



further information can be obtained V>>^m>' 



by exposing the contents of the sheath. 

 These are four fine lance-like struc- 

 tures which are apparently attached 

 to a broader appendage near the head. 

 (Fig. 38.) 



Fig 39. — The under surface of the squash bug showing the 

 position of the two glands, (a) which secrete^the, f oul odour, 

 the beak (b), the antennae (c). (Original.) ; 



f^^'^The mouth- parts of the common locust are 

 shown in figure 40, and it is evident that the 

 different parts are adapted for biting and holding 

 the object while biting. With the squash bug, 

 however, the parts are not adapted for biting, but 

 for sucking. The lower lip or labium forms the 4- 

 jointed, grooved sheath, and the mandibles and maxillae form the four lance-like 

 piercers, while the labrum is a scale-like flap to which, apparently, the piercers are 

 attached. It will be obiserved that there are no palpi on either the maxillae or labium, 

 but the parts have been modified for piercing and sucking. 



Fig. 40. — The mouth parts of the com- 

 mon locust dissected out, the upper lip 

 or labrum, (a) the mandibles, (b) the 

 maxillse, (c) and the under lip or lab- 

 ium, (d) (Original.) 



