AMERICAN HYMENOPTERA. 53 



anterior pair distinctly wliite before ; tibiae simple, first tarsal joint as 

 lon<i; as all tbe rest. Wings violaceous sub-hyaline, most obscure in 

 marginal cell ; first subn)arginal cross nervure imperfect; recurrent 

 nervures received in middle of second and third cells ; third cell con- 

 tracted below, half as wide as above; lanceolate cell widely contracted; 

 under wings with two inner cells, no lanceolate cell. 

 Cordova, t. c. Mexico. One male. (H. deSaussure.) 



2. Sericocera villosus, n. sp. 



]ihie.k, antennsB setaceous, villose, thorax waxeu, wings violaceous. Length 

 0.35. Br. wings 0.92 in. 



9. Mead and abdomen black ; antenniie black, not longer than to 

 scutel, setaceous, woolly, with black hair; head small, not more than 

 two-thirds the width of thorax ; tegulte and whole of thorax pale 

 yellow waxen color; thorax quite globular before; abdomen black, 

 short and stout. Anterior coxjb, femora and tibiae before, medial 

 coxae and femora, except tips, 3-ellowish; remainder of legs black. 

 Wings violaceous, quite ample, darkest toward base, a dark spot cover- 

 ing marginal and upper half of submarginal cells ; stigma black, first 

 submarginal cell almost square, second and third each with a recurrent 

 nervure in middle ; third submarginal contracted below, its outer ner- 

 vure angulate, with a short produced nervure near upper end, below 

 upper bullae; lanceolate cell widely contracted; under wings with two 

 middle cells, their lanceolate cell small, with an indistinct cross line 

 above. 



Cordova, t. c. Mexico. One 9 . (H. deSaussure.) 



?>. Sericocera alternator, n. sp. 



Ochraceous; head, metathorax and breast black; wings semi-obscure. 

 Length 0.40. Br. wings 1.02 iu. 



9 . Shining, ochraceous. Basal joint of antenna3 black, remainder 

 wanting ; head not as wide as thorax, black ; eyes widely separated ; 

 ocelli ruby colored ; nasus slightly emarginate; tegul* black ; thorax 

 and abdomen ochraceous, with the metathorax, and a large spot on 

 breast black; abdomen stout; coxec and legs black; the anterior pair 

 pale before. Wings atnple, violaceous semi-obscure, darkest at base; 

 stigma and nervures black; first submarginal cross nervure obsolete, 

 second and third cells receiving the recurrent nervures in middle; 

 third contracted to half its width below; lanceolate cell widely closed, 

 that in lower wing wanting. 



.Talapa, Mexico. One female. (H. deSaussure.) 

 4. S. (Hylotoma) compressicornis, Klug, Jahrbuch. 1834, 249, 93, 9 . — Brazil. 

 ;"). S. (Hylotoma) hypoleuca, Klug, Jahrbuch. 1834, 250, 95, 'J, .—Brazil. 



