188 STUDIES IN AMERICAN TETTIGONIIDAE (oETHOPTERa) 



Conocephalus resacensis ^^ new species (PL XV, fig. 6; XVI, 7; XVII, 7; 



XVIII, 13 and 14; XX, 8.) 



The present species somewhat resembles C. allardi and C. 

 hrevipennis but differs from both in the attenuate form, wider 

 vertex, smoother pronotum with lateral lobes even more elongate 

 than in allardi, different and paler coloration, much more elongate 

 caudal femora with genicular areas not darkened, (genicular lobes 

 normally unispinose as in allardi), and very different male geni- 

 talia, though with subgenital plate of the normal type of the 

 subgenus Xiphidion, as found in hrevipennis. 



Type. — cf ; Piper Plantation near Brownsville, Texas. August 

 3, 1912. (Rehn and Hebard.) [Hebard Collection, Type No. 171 .] 



Description of Type. — Size rather large for the genus, form slender and 

 surface very smooth. Head with dorsum of vertex, when seen from the lateral 

 aspect, scarcely at all depressed proximad, in same plane as the occiput; 

 fastigium of vertex nearly as wide as basal antennal joint, narrowing with a 

 decided concavity to facial suture; eyes normal. Pronotum elongate, round- 

 mg smoothly into the lateral lobes which are considerably longer than deep 

 with surface very smooth, cephalic margin of lateral lobes broadly and evenly 

 arcuate to the ventro-caudal angle which is moderately rounded and rectangu- 

 late, caudal margin of same very weakly convex to the very shallow and 

 scarcely appreciable humeral sinus, convex callosity very broad, somewhat 

 broader than in allardi and decidedly broader than in hrevipennis. Tegmina 

 slightly more than half the length of the caudal femora, structure very deh- 

 cate with veins weaker than in hrevipennis; stridulating area similar but smaller 

 in proportion with stridulating vein and veins of the speculum decidedly 

 heavier than in that species, in this latter respect more as in allardi; wings 

 shghtly shorter than tegmina. Abdomen and cerci unicolorous. Cerci elong- 

 ate; the median half quite evenly and decidedly swollen and bearing on the 

 internal margin at the point of gi-eatest diameter a rather long tooth, which 

 is broad at its base and is situated slightly lower than mesad (in vertical sense) 

 but entirely visible from above, this tooth directed meso-ventrad with apex 

 sharp and decurved; external margin of cercus very weakly concave, nearly 

 straight; distad the cercus narrows evenly from the swollen portion to the nai-- 

 row blunted apex, which portion of the cercus is very weakly depressed. Sub- 

 genital plate bearing disto-laterad styles .7 mm. in length, the sockets of which 

 are produced beyond the transverse distal margin of the plate. Cephalic and 

 median femora much as in hrevipennis, caudal femora very long and more 

 attenuate than in hrevipennis, with enlarged proximal portion tapering much 

 more gently and with ventral margins unarmed, genicular lol^cs unispinose.'^ 



2'^ In reference to the "resacas" or ancient and now cut off and dried out 

 curves of the Rio Grande, in the gi-asses of which, surrounded by the low heavy 

 jungle of the river plain, the present species makes its home. 



^~ The immature male before us shows this character to be varial)l(\ as this 

 specimen has the genicular loljes Ijispinose. 



