288 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



caudal prolongation of 6 mm. ; similar large males are common in 

 the series of luca> taken in Lower California. The hind tibise are 

 curved in basal half, straight and thickened toAvard apex as in luca'. 



General ohser cations. — The middle lobe of the mentum in the ex- 

 amples at hand is triangulo-trapezoidal. more or less arcnately 

 rounded at apex; surface is coarsely punctate, just noticeably convex 

 and scarcely at all foveate laterally. 



The prosternum in the series under examination is rounded antero- 

 posteriorly, feebly nuicronate or not. In the larger examples it 

 Avould no doubt be strongly mucronate as in luca^. In a large male 

 without locality and in the U. S. National Museum collection, the 

 prosternum is horizontally and triangularly nuicronate, exactly as in 

 the large specimens of luca'; the specimen measures 33 mm. Two 

 accomi)anying females have similar prosterna. These specimens are 

 without doubt from Mexico. 



The mesostermun is the same as in luco'^ except that it is less ver- 

 tically oblique. 



The abdominal process is subquadrate and feebly transverse, in 

 Avidtli equal to the length of the third segment ; the post-coxal por- 

 tion of the first segment is equal in length t<^ that of the second ; 

 the third is scarcely twice the length of the fourth and about a third 

 of its length shorter than the second. 



The abdominal jjrocess is about a fourth of its width greater than 

 that of the metasternal salient. 



The metasternum laterally between the coxse is about equal in 

 length to the width of a mesotibia at apex. 



The tibial grooves of the femora are well defined, margins carini- 

 form, floors plane, opaque and smooth. Those of the profemora 

 nearly attain the femoral base and the margins become contiguous. 

 The margins of the grooves on the mesofemora become evanescent 

 at the internal fourth before becoming contiguous. On the meta- 

 feniora the margins are evanescent at internal third. The meso- and 

 metafemora have the grooves somewhat narrow. On the profemora 

 the anterior margin of each groove is dentately laminate fft external 

 fourth. 



The protibia) are more or less carinate externally and not com- 

 pressed ; the articular cavities are more or less open, and the tarsal 

 grooves are more or less developed and scabrous. 



The meso- and metatibise are not carinate externally and the artic- 

 ular cavities are closed. The tarsal grooves of the mesotibise are 

 quite Avell defined in apical two-thirds; the sides of the grooves are 

 nnu'icate and the floors smooth and opaque. The metatibite are sim- 

 ply flattened externally or feebly grooved and muricate. 



The tarsi are moderate in length and stoutness. 



