290 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxii. 



2(i. Pronotal disk narrow, the lateral lobes strongly declivent; lateral carina' dis- 

 tinctly convergent anteriorly ( tig. 88) Clinoplenra, p. 398 



Pronotal disk broad, the lateral lobes less declivent; lateral carinas subparallel. 



Platycleis, p. 403 



In the following treatment. I have made little attempt at arranging 

 the genera in a natural order, contenting myself with keeping JVeo- 

 h(irrctt!a^ Nednha, and A<ila<)tJi(>r((,r together, by rea^son of their gi'oup 

 affinities, and ha\'ir.g the genera with the prostenmm unarmed follow- 

 ing those with the prosternum armed, 



AGLAOTHORAX, new genus. 



Tropizaspis Scuduek, Proc. Anier. Acad. Arts Sci., XXXV, 1899, pp. -83, 87 

 (part).— KiRBv, Syn. Cat. Orth., II, 1906, p. 191 (part). 



IJescrlptioii. — Head moderate in size; eyes rounded, small, not very 

 prominent; vertex scarcely a third as broad as the interocular space. 

 Prosternmii armed with moderately long spines, with very short spines 

 or wholl}^ unarmed. Pronotum nearly flat above, being but a little 

 higher in the middle, and with low but persistent median carina; lat- 

 eral carintv scarcel}^ indicated on the anterior fifth, from that point 

 .backwards distinct and roundly bowed outwards, making the pronotal 

 disk ?)roadly ovate (tig. 2), behind semicircularly rounded, the ante- 

 rior margin truncate; lateral lobes well developed, nearly perpendic- 

 ular, much longer than high, the posterior margin scarcely sinuate. 

 Organs of flight aborted in the female, developed but not, or scarcely, 

 projecting beyond the pronotum in the male. Legs short and stout, 

 posterior femora less than twice as long as the pronotum, except in 

 one species, and nmcli swollen in the basal half; anterior tibite armed 

 above on the outer margin with an apical spine and dorsally, opposite 

 the end of the hearing organ, with another small spine, the latter some- 

 times absent: inner margin of the anterior tibite unarmed or with a 

 single apical spine; posterior tibige with but two apical spurs beneath, 

 the plantula moderately large and well developed. Supraanal plate 

 concealed in l)oth sexes, being covered by the unusually expanded and 

 extended anal segment; subgenital plate broad, apical ly more narrowly 

 rounded in the female, that of the male furnished with a pair of small 

 apical st3des, usually very inconspicuous; the male has a pair of more 

 or less flattened organs lying between the supraanal and subgenital 

 plates, which are termed supragenital or infracercal plates; cerci of 

 both sexes simple, conical; ovipositor shorter than the posterior femora, 

 curved strongl}^ upwards. 



Tyj)^' — Troplz<M}ns ovata Scudder. 



This genus, known as yet only in the western part of the United 

 States, is distinguished from JSfedxha, to which it is allied, by the broad 

 oval thorax and the short posterior f emorse of most of the sj^ecies. The 

 general appearance of the members of the two genera are very difler- 



