662 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



terminal segment less than four times as long as the apical width, 

 where it is considerably expanded and entire, not ventrally cleft; 

 fourth segment of the palpi about one-half as long as the fifth, the 

 third a httle longer than the fourth, the first and second subequal in 

 length with the fourth. Pronotum moderately broadening pos- 

 teriorly, evenly rounded dorsaUy, whoUy without carinae, fore and 

 hind margins truncate, the lateral lobes longer than high, the sides 

 parallel, without humeral sinus, the lower margin horizontal and very 

 broadly rounded; meso- and metanotum together somewhat longer 

 than the pronotiun and slightly broader, the lateral lobes descending 

 a httle lower than those of the pronotum, the lower margins rounded 

 and somewhat ascending posteriorly. Legs very short, the fore 

 femora no longer than the pronotum and the posterior ones scarcely 

 or barely reaching the tip of the abdomen; femora unarmed above 

 and below, without genicular spines; fore and middle tibiae unarmed 

 above and below except apically, the hind tibiae unarmed beneath 

 but armed above on both margins for nearly the entire length with 

 short spines of two grades, about every other spine being somewhat 

 shorter than the others; apical calcars short, the longest barely longer 

 than the longest of the dorsal spurs; tarsi short, the second segment 

 of none of them longer than deep; posterior metatarsus produced 

 above into a tapering pointed process about as long as the second 

 segment (fig. 6). Abdomen large and plump, scarcely tapering 

 posteriorly; subgenital plate of the male sunquadrate, apically sinuate 

 by ventral sulcation, without styles; last dorsal segment; of the male 

 cleft nearly to the base; subgenital plate of the female about as 

 broad as long and apically divided into three pointed lobes; supraanal 

 plate of the male nearly hidden beneath the last dorsal segment; of the 

 female roundly triangular, centrally depressed above; carci of both 

 sexes simple, cylindrical and very short and stout, straight in the 

 female, in the male straight or recurved; ovipositor short, about as 

 long as the pronotum, and stout, conspicuously armed below on the 

 inner valves and above on the outer ones, which are moderately 

 curved upward and shghtly longer than the lower ones; the true 

 inner valves are here as long as the true lower ones, usually called the 

 inner ones, and unarmed. 



Two species comprise this genus, hilohatus Thomas, the type of the 

 genus, and genitalis new species, described herein. These two species 

 may be separated as follows: 



KEY TO THE SPECIES OP GAMMAROTEITIX. 



Cerci of male straight, about three times as long as the basal width (fig. 4); subgenital 

 plate of the male with a transverse black band; subgenital plate of the female 

 divided into three somewhat slender fingers (fig. 5) bilobatus Thomas. 



Cerci of the male curved backward and more than three times as long as the basal 

 width (fig. 7); subgenital plate of the male unicolorous; subgenital plate of the 

 female divided into three shorter triangular teeth (fig. 8) genitalis, new species. 



