150 HYMENOPTEBA. 



11. Crabro guerrerensis. (Tab. IX. fig. n, $ .)- dU^-^>^ (^^^j^^ew^^ 



Niger, aciculatus ; capite thoraceque opacis, abdomine nitido ; alis fumatis. $ . jLq^JIxs*~*4l (^ j3*~+^Jm$^m**4$J^ 7 

 Long. 7-8 millim. *Vur»VT,.y ' ^> ^SX>) 



Eab. Mexico, Amula 6000 feet, Chilpancingo 4600 feet, both in Guerrero (H. H. 

 Smith). 



Head shining, finely punctured, alutaceous, sparsely haired, the cheeks and clypeus 

 densely covered with silvery pubescence. Vertex depressed, and with a shallow furrow 

 running down from the ocelli; front rather widely excavated, shining, impunctate. 

 Clypeus broadly keeled in the centre. Ocelli in a triangle; the posterior ocelli 

 separated by a little more than the length of the second antennal joint, and by one 

 half more from the eyes, — by a much greater distance from the eyes than from each 

 other. There is a narrow keel behind the ocelli, and an indistinct shallow furrow 

 runs obliquely from them to the eyes. Pronotum transverse in front, the lateral 

 angles somewhat obliquely rounded, the middle indented ; propleurae deeply and widely 

 excavated, finely and closely punctured ; mesopleurae coarsely aciculated, semiopaque ; 

 scutellum shining, finely punctured ; the propleurae shining, almost impunctate. Basal 

 area of the median segment large, wider than long, shining, impunctate ; the centre 

 furrowed ; the rest of the segment shining, finely punctured ; the metapleurae finely 

 and closely longitudinally striated; apex of the median segment with a gradual 

 rounded oblique slope. Petiole shining, impunctate, gradually, but slightly, enlarged 

 towards the apex, a little longer than the second segment. The second and third 

 segments obscurely and finely aciculate; the penultimate segment densely pilose; 

 the hypopygium wide, sharply narrowed towards the apex, shining, the base punc- 

 tured. Legs covered with a white pubescence; the long spur of the hind tibiae 

 rather more than three-quarters of the length of the metatarsus. The transverse 

 cubital nervure received about one fourth before the middle of the radial cellule. 

 The third joint of the antennae is longer than the fourth, which, again, is longer than 

 the second. 



^ 12. Crabro yucatanensis. (Tab. IX. fig. 12, $ .) 



Niger, antennis rufo-testaceis ; scapo antennarum, genieulis tarsisque flavis ; nitidus, segmento mediali opaco, 



rugoso ; clypeo 4-dentato ; alis hyalinis, nervis nigris. $ . 

 Long. 4*5 millim. 



Hab. Mexico, Temax in N. Yucatan (Gaumer). 



Vertex impunctate ; the front roughened ; sparsely haired. Clypeus with a distinct 

 narrow keel down the centre; the apex almost transverse, and with four stout teeth — 

 the two inner obtuse at the apex, the outer triangular. Frontal groove wide, rounded 

 at the top. Ocelli in a subtriangular curve ; the hinder ocelli separated from the eyes 

 by a somewhat greater distance than they are from each other. Eyes coarsely faceted. 

 Antennae stout, the scape yellow ; the flagellum rufous, covered with a pale microscopic 



