220 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. xx. 



in the male, broadening a little anteriorly; frontal costa faintly wider 

 than the interspace between the eyes, equal, fading just before the 

 clypeus, feebly sulcate at and below the ocellus, punctate above; eyes 

 rather large and rather prominent, particularly in the male, half as 

 long again as the infraocular portion of the genae ; antennae ( ?). Prono- 

 tum feebly enlarging on the rnetazona, the lateral lobes with only 

 broken signs of a postocular dark band on the prozona, the disk very 

 broadly convex, passing by a distinct rounded angle, forming a feeble 

 lateral carina. into the rounded subvertical lateral lobes; median carina 

 distinct but slight on the metazona, subobsolete or obsolete on the pro- 

 zona; front margin truncate, hind margin strongly obtusangulate; 

 prozona feebly transverse, but lifctle longer than the densely and not 

 very finely punctate metazona. Prosternal spine moderately long, rather 

 slender, at least in the male, conical, erect; interspace between meso- 

 sternal lobes nearly twice as long as broad (male) or quadrate (female). 

 Tegniina as long as or slightly longer than the pronotum, ovate, moder- 

 ately broad, attingent or overlapping, apically acuminate. Fore and 

 middle femora a little tumid in the male; hind femora not very long, 

 somewhat compressed, uniform light testaceous, with fuscous genicular 

 arc; hind tibiae light testaceous, the apical half of the spines black, nine 

 to ten in number in the outer series. Extremity of male abdomen 

 hardly clavate, a little recurved, the supraaual plate triangular, with 

 acutangtilate apex, the surface nearly plane, except that it sweeps up to 

 the sharp, elevated, and apically united subinedian ridges inclosing a 

 very narrow and deep median sulcus, which crosses two- thirds of the 

 plate; furcula consisting of a pair of approximate, small, triangular 

 denticulations, no longer than the last dorsal segment, overlying the 

 ridges of the supraanal plate; cerci small, sub falciform, tapering to two- 

 thirds the basal width on proximal half, beyond equal, bent a little 

 inward and curved upward, exteriorly sulcate, apically rounded, much 

 shorter than the supraanal plate; subgenital plate small, feebly sub- 

 conical, projecting slightly, the apical margin rising very feebly to an 

 obscure apical tubercle, and as seen from above with a parabolic curve, 

 entire. 



Length of body, male, 14 mm., female, 20 mm. ; tegmina, male, 3.5 mm., 

 female, 5.5 mm.; hind femora, female, 12 mm. 



One male, 1 female. Cape St. Lucas, Lower California, J. Xantus. 

 The single pair are somewhat broken and have been bleached in alcohol, 

 so that the colors of the above description will have to be revised with 

 fresh material. 



12. DAWSOKI SERIES. 



This group is composed of rather heterogeneous material if the ma- 

 cropterous forms alone are considered, and is even more loosely com- 

 pacted when the brachypterous species are mingled with them. In 

 size they range from rather small to medium. A single species is 

 dimorphic, being both brachypterous and macropterous, 



