460 Report of the Department of Entomology of the 



completely taken up by their appendages. The sternum of the 

 seventh segment is longer and touches the base of the ovipositor. 



Fifth instar (Plate XXVIII, fig. 5): The first pair of wing pads 

 reaches to the second abdominal segment and the second pair reaches 

 to the third or fourth segment. (Fig. 26, e.) Cerci and ovipositor 

 are twice as long as in preceding stage. Front tibiae have a swelling 

 near the proximal end, at which point in the leg of the adult insect 

 a tympanum occurs. 



Adult (Plate XXVIII, fig. 6).— Body slender. Long axis of head 

 in life nearly horizontal. Pronotum slightly elongated ; disk narrowed 

 in front; sides nearly vertical at hind edge, flaring outward in front 

 part. Abdomen composed of ten segments, including the last which 

 bears the cerci and anus. First segment much reduced ventrally. 

 Antennae filiform; over twice the length of body. Legs slender; 

 hind femora a little thickened. Hind tibiae with a double row of 

 teeth on posterior side, intermixed on distal half with longer spines; 

 with three pairs of spurs at the tip. Anterior tibise with a tympanum 

 near the base. 



The hind wings of both sexes are folded and generally extend 

 beyond the tip of the fore wings. 



Males have the forewings much broader than body. A longi- 

 tudinal fold occurs about one-third way from the costal margin; 

 the inner two-thirds lies horizontally over the back and the remainder 

 is deflexed toward the sides. 



The fore wings of the female are regularly reticulated, much 

 narrower than those of the male, and are wrapped closely around 

 the body. A longitudinal bend of about ninety degrees is located 

 about half way between the two margins. 



NATURAL ENEMIES. 



The tree crickets of the genus CEcanthus are, throughout their 

 normal range of distribution, subject to the attacks of a number of 

 natural enemies. The most common and efficient of these are egg 

 parasites, of which there are eight known species. These are 

 hymenopterons, three species belonging to the Chalcidoidea and five 

 species to the Proctotrypoidea. In view of the confusion which has 

 existed in regard to the identity of the different species of tree crickets, 

 we cannot feel sure that the hosts of the parasites have been correctly 

 recorded. Judging from the statements that accompany the descrip- 



