(') HYMENOPTERA. 



are described as increasing in thickness to their extremity, the 

 spur at their apex broad at the base, as is also the basal joint 

 of the tarsi. In the insect described, the tibiae are of equal 

 thickness two-thirds of their length ; in other respects they 

 perfectly agree. 



7. Labidus morosus. 



Male. Length 9 lines. — Brown-black, covered with fine brown 

 silky pubescence : the ocelli placed in a curve on the vertex, 

 not smaller than in the other species, the space between the 

 posterior pair smooth and shining and slightly concave; the 

 antennas, mandibles, and legs rufo-testaceous; the mandibles 

 long and very slender. Thorax oblong- ovate, gibbous in front 

 and at the scutellum ; wings brown, the nervures brown-testa- 

 ceous ; the marginal cell acute at the base and apex, extending 

 beyond the second submargiual cell one-third of its length ; the 

 second submargiual cell narrow, receiving the recurrent nervure 

 one-third from its base; the legs slender, covered with long 

 hair. Abdomen with the margin of the segments slightly con- 

 stricted, and rufo-testaceous ; the apex of the abdomen and the 

 ventral segments with long fine hair; the peduncle transverse; 

 concave above, the lateral posterior angles prominent and obtuse ; 

 the apical segment compressed vertically; the apical ventral 

 plate furnished with two acute, stout, curved spines. 

 Hab. Mexico. 



This species in some respects resembles Labidus D'Orbignii, 

 described in Shuckard's ' Monograph ;' but the size of the ocelli, 

 form of the peduncle, and different neuration of the wings ap- 

 pear to characterize a distinct species. 



8. Labidus amplipennis. 



Male. Length 7 lines. — Rufo-testaceous : the head fuscous ; 

 the ocelli large, glassy bright, placed on the hinder margin of the 

 vertex in a slight curve ; the face anteriorly, the labrum, and 

 antennas rufo-testaceous. Thorax very gibbous in front, as also 

 at the scutellum ; the metathorax perpendicularly truncate ; 

 wings ample, one-fourth longer than the entire insect; the 

 nervures testaceous ; the marginal cell lanceolate, acute at the 

 apex, nearly as long as the first and second submarginals united ; 

 the first submargiual oblique-quadrate, its width half that of 

 the lower margin of the second submarginal, the latter narrowed 

 towards the marginal cell ; the legs slender. Abdomen shining ; 

 the peduncle quadrate, slightly concave above, and of the same 

 width as the abdomen ; the apical segment fusco-ferruginous. 

 Hab. Bogota. 



