JOURNAL OF ENTOMOLOGY AND ZOOLOGY 147 



of the third abdominal segment; in some specimens the tarsal seg- 

 ments are much nearer to the posterior margin of the third abdomi- 

 nal segment, but there is always a marked difference in the tips of 

 the tarsi of the various legs. 



Male. Cephalic crest viewed from the side, triangular, ending in 

 an acute point which is directed strongly forward (Plate II, Fig. 

 1). Viewed from beneath (Plate II, Fig. 2), the lobes are con- 

 spicuously triangular, pointed, lying parallel or slightly divergent 

 and separated by a deep median split. Spine on the scape of the 

 antennae very large, conspicuous; tubercle on the labrum strongly 

 developed. Pronotal breathing-horns short, straight. Mesonotum 

 strongly crenulated along the middle line; scutellar lobe not devel- 

 oped. Posterior leg sheaths extending beyond the level of the mid- 

 dle legs, which, in turn, are longer than those of the fore legs. 

 Wing pads dark, the venation not showing clearly, but if made out 

 the very short cell R- and the reduced M are characteristic of Hexa- 

 toma alone. Abdomen with about 34 spicules on sternite 4; about 

 30 in a straight uninterrupted row on tergites 3 and 4; about 20 on 

 tergite 5. Hypopygium with the sternal lobes strongly rounded, 

 enlarged and bent strongly dorsad. 



Length: From crest to tip of the abdomen, 9.2-9.6 mm. 



Dextro-sinistral width at wing-pad: 1.2 mm. 



Dorso-ventral depth at wing-pad: 1.4 mm. 



Female. As in the male, the ovipositor viewed from the side 

 with an obtuse notch. From beneath, the sternite is obtusely 

 pointed with a deep median split. From above, the tergite is almost 

 flat across the caudal margin, the lateral angles rounded, a deep 

 median split. The antennal sheaths are much shorter than in the 

 male (Plate II, Fig. 3). 



Both sexes of the pups described from numerous specimens from 

 Cascadilla Creek, Ithaca, N. Y., May 2, 1913; May 6, 1914. 



The larva of Hexatoma in many respects is close to Eriocera 

 fidtonensis Alexander in the shape of the markings on the stigmal 

 disk, the teeth on the mandible and the lateral lobes of the labrum. 

 The pupa, on the contrary, suggests Eriocera longicornis Walker 

 very closely in the shape of the cephalic crest, appearance of the 



