650 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxx. 



ALCAMENES CRISTATUS, new species. 



Rather above the medium, moderately robust (female), or .somewhat 

 slender (male), the two sexes very unequal in size. Uniformly grass- 

 green, or sometimes bruneo-testaceous above, in the former specimens 

 provided with a brownish purple line along the late^ral carime and hind 

 margin of dorsum of pronotum. The dorsal field of the tegmina also 

 more or less tinged with this color. All the tibia' and antennte more 

 or less strongly infuscated. Venter pale yellowish. 



Body greatly compressed, much higher than broad. Head about as 

 wide as the front edge of the pronotum, eyes small, elongate, in the 

 male not quite, in the female a tritie more than, one-half as long as the 

 cheeks below them, rather widely separated above; occiput somewhat 

 inflated and provided with a series of line transverse ridges or ruga?; 

 fastigium of the vertex nearly horizontal, broadly triangular, with a 

 tine longitudinal median carina that continues posteriori}^ to the occi- 

 put; frontal costa moderately prominent between the antennte, (}uite 

 narrow above but evenl}' broadening below, punctate nearh' through- 

 out and ver}' gently sulcate in the vicinity of the ocellus. Antenna^ 

 of moderate length, somewhat incrassate, the basal joints depressed 

 but not sufficientl}^ so to give to these members even a subensiform 

 appearance, inserted between the upper portion of the eyes. Prono- 

 tum tectiform, broadly and evenly arched, rugose at sides, coarsely 

 granulose above, the anterior lobe shorter than the posterior; the 

 transverse sulci continuous, severing both the lateral and median carina?, 

 anterior and posterior edges acuteK' produced on occiput and over the 

 base of tegmina; lateral carinie finely crenulate, the median smooth, 

 and the lower lateral edges provided with a series of smooth pale 

 tubercles. Tegmina coriaceous, very profusely and minutely veined, 

 somewhat abbreviated, elongate ti'iangular, their apices reaching two- 

 thirds (female) or nearly four-fifths to the tip of the abdomen, without 

 maculation. Wings not as long as tegmina. Hind femora slender, in 

 the males a little surpassing, in thefemales not quite reaching, the tip 

 of the a))domen. Prosternal spine coarse, robust, long, curved to the 

 rear and tapering on apical half, the tip reaching over the base of 

 me.sosternum. 



Length of body, male, 30; female, 58; of antonna% male and female, 

 13.5; of pronotum, male, 19; female, 23; of tegndna, male, IT; female, 

 23; of hind femora, male, 20; female, 25 mm. 



Ti/pe.-Cfit No. 9723, U.S.N.M. 



Habitat. — Sapucay, Paraguay, 9 males, 9 females, and 1 nymph. 

 W. T. Foster, collector. 



At first glance this insect, on account of its long and strongly crested 

 pronotum, reminds one of a short-winged and (\\m\nni\yQ, Prio)wIoj>/ia 

 aarata which occurs in the same region. The genera Alcamenes and 



