NO. 1530. THE DECTICIN.E OF NORTH AMERICA— CAUDELL. 305 



The locality where the specimens were taken is the least known corner of Mexico — 

 hilly, with dried up vegetation during about one-half of the year. The species 

 seems to be cupuscular in habits. It was almost impossible to find a specimen 

 during the daytime, and I do not believe the males stridulate long after dark, for I 

 slept several nights in a tent in the "Chaparral" among them, and do not remem- 

 ber hearing them after dark. The shrubs which they inhabit are a compact grow- 

 ing species, affording a place of concealment by day, while their thick tops offer 

 unusual advantages for the roof-garden concerts of the stridulators at twilight. The 

 stridulation is feeble and not continued beyond a few seconds with a period of rest. 

 When captured they offer little or no defense, and their saltatory powers are small 

 and not willingly used. 



REHNIA, new genus. 



Descrijption. — Male, female unknown. Head medium, slightl}^ 

 broader than the anterior portion of the pronotum; eyes large and 

 prominent; vertex extending between the bayal segments of the 

 antenna; as a much compressed projection, distinctl}^ separated, from 

 the face. Pronotum of medium size, moderately produced posteriorly 

 and the disk abruptl}" elevated behind as in the preceding genus; the 

 anterior and posterior margins of the pronotum are truncate or 

 broadly rounded; hiteral lobes deep, nearl}' vertical, margins nearly 

 straight, humeral angle scarcely indicated; lateral carinic not indicated 

 except very slightly so on the posterior margin; median carina not 

 indicated. Prosternum armed with a pair of long sharp spines. 

 Organs of flight fairly well developed, nearly or quite two times as 

 long as the pronotum, the elytra apically narrowly rounded, tympanum 

 well developed, occupying one-half the length of the el3^tra. Legs 

 long and stout, the posterior femora about three and one-half times 

 as long as the pronotum and considerably but gradually swollen on 

 the ba.sal half, the genicular spines sharp and prominent; posterior 

 tibiffi a little longer than the corresponding femora and armed below 

 with four terminal spurs; plantula short; anterior tibise armed above 

 on the outer carina only with live spines. Subgenital plate moder- 

 ately broad and long, apically triangularly incised and with a pair of 

 short stout apical styles; supraanal plate triangular, nearly hidden; 

 last abdominal segment broad and short, roundly incised mesially; 

 cerci basally flattened, inwardly concave, the apex slender and incurved, 

 the upper portion of the flattened base slightl}" produced in the form 

 of an inner tooth. 



Type. — Rehn'ia vlctoriae^ new species. 



Superficialh^ this genus bears some resemblance to Neoharrettla 

 Rehn, but structurally it is very difl'erent, in a natural classification 

 falling into a difterent section, the former genus belonging to the sec- 

 tion Rhacoclees and Rehn la to the section Gampsoclees. 



There are two species of this genus before me, the type from 

 Mexico and a second very distinct species supposedly from the United 

 States. These two species may be separated as follows: 

 Proc. N. M. vol. xxxii— 07 20 



