October 1S94.' 



PSYCHE. 



151 



end to receive them ; otherwise it is 

 identical with cristatiis. 



I have already indicated (Psyche, 

 1894, 53, 54) my opinion of the rela- 

 tion of these two forms : that car hiatus 

 is but a reversion to the earlier long- 

 winged type of female, such cases being 

 not uncommon. This conclusion was 

 reached independently, from examina- 

 tion of my material, before becoming 

 acquainted with Bolivar's work. 



Blatchley states (Can. ent. 1892, 

 33) that he regards carinatus and 

 cristatiis as distinct as the two forms 

 of Tettigidea. Typically they are, but 

 specimens intermediate in structure are 

 met with in both cases, and in addition 

 the great proportional rarity of the 

 long-winged form is to be considered in 

 this case. The following measurements 

 showing the relations of pronotum, 

 hind femora and wings will be of 

 interest in this connection. Those of 

 carinatus are based on but seven speci- 

 mens, those of t:r/^/'(i;/«5 on a very large 

 number. 



Crhtatui tbnii. 

 Total length. Pron. Pron.> Hind fern. Wing <.Pro}j ^ 



i 7-7- 9- 7-I-S.5 -'■-+•5 -S-'-S 



9 S.6-10.2 S. -9.5 — 5--i-i- •7-^- 



Carinatus form. 



Total Uitglli. Pron. Pron.> Iftnd fern. \Ving> Prott. 

 } n.-u-s 9.5-10.7 2.-.. .4- .3 



$ 11.-12.5 9.8-11.5 I.-2.S .3-1. 



One female carinatus has the pro- 

 notum extending but i mm. beyond the 

 hind femora and the wings but .3 mm. 

 beyond the pronotum, thus being inter- 



mediate in structure, although ap- 

 proaching carinatus more closely. 

 Looked at from above it can scarcely 

 be distinguished from cristatiis, but a 

 glance at the side reveals the fully 

 developed wings. The markings are 

 identical in character, both forms being 

 either plain or spotted. No difference 

 is perceptible in the proportions of the 

 hind femora as wouUl be likely in the 

 case of a winged and wingless species, 

 nor in the vertex or the occiput which 

 vary characteristically in this group. 



Description. — Antennae 12 to 13 jointed, 

 usually 12; occiput bearing a pair of nipple- 

 like protuberances, very small but not to be 

 confused with the granulations of the surface, 

 one on each side opposite the hinder part of 

 the eyes. These are distinct in even young 

 specimens. Vertex projecting, rounded ; its 

 median carina high, projecting considerably 

 in advance of the margin; frontal costa 

 sharply excised opposite the eyes. Pro- 

 notum with anterior inargin advanced upon 

 the liead, the sides excavate. Median carina 

 cristate, arched longitudinally, higher oppo- 

 site shoulders, gradually becoming lower 

 toward the rear; its outline sometimes a little 

 flattened just behind the shoulders. Dorsal 

 sinus of lateral lobe about i as deep as the 

 ventral sinus, its anterior margin only 4 as 

 long as the dorsal margin of the ventral 

 sinus, its angle more or less obtuse or nearly 

 right, the lobe between the two sinuses 

 obtusely rounded. Hind thighs stout, the 

 breadth contained 2.t times in the length. 

 Elytra longer and narrower than in our 

 species of Tettix, acuminate at the apex. 



Habits. — This curious little locust is 

 the smallest Acridian antl the common- 

 est species of the subfamily occurring 

 in New England and is vvidespread in 

 distribution. It is common locally over 



