114 AMERICAN HYMENOPTERA. 



Head entirely black ; face finely and densely punctured ; ocelli small ; 

 eyes black, flecked with fulvo-ferruginous, slightly emarginate ; antennae 

 fulvous, darker at apex ; basal joint sometimes black, two-thirds the 

 length of the body ; clypeal fovese deep. 



Thorax finely and densely punctured ; middle of mesonotum and 

 mesopleurae shining, anterior margin of the mesonotum with a small 

 protuberance on each side ; parapsidal furrows converging towards the 

 scutellum and confluent slightly beyond the middle, forming a Y-shaped 

 groove, each containing a more or less distinct carina ; scutellum con- 

 vex, densely punctured, deeply excavated in front and with a well- 

 defined carina on each side ; metathorax opaque-black, finely pubes- 

 cent, flat, only slightly excavated behind, with a shallow median furrow, 

 and sometimes quite strongly contracted at the base ; finely and longi- 

 tudinally striated behind, the sides more coarsely; in one specimen the 

 metathorax is finely reticulated all over. 



Wings uniformly dark fuscous, with brilliant violaceous reflection ; in 

 some specimens the apical margins lack this reflection; nervulus inter- 

 stial or nearly so ; nervellus broken well above the middle ; legs and 

 abdomen smooth, shining black. 



Abdomen impunctate, rather broad and compressed ; basal segment 

 the longest and swollen at the apex, the second segment one-fourth 

 shorter, gradually broader towards the tip, with a shallow longitudinal 

 furrow on the basal half of each side ; third segment shorter than the 

 second and slightly longer than broad, the remaining segments broader 

 than long. 



In describing this species I have compared the cotypes and 

 one female specimen with the original description. 



CotyPes — Two 9 and one cf . American Entomological 

 Society. 



This distinct species is easily recognized by the brilliant 

 reflection of body and wings. Mr. Cresson states that "in 

 the male the wings are not so dark, the apical margins being 

 subhyaline, and the violaceous reflection not so deep." I find, 

 however, that this condition appears frequently in the female, 

 and is apparently a minor variation common to both sexes. 



T. erythroceriis Cameron is possibly synonymous with this 

 species, but as I have not seen the type I am unable to say 

 definitely. T. morio, moi-osus, niger and cyaneus are also re- 

 lated, but may be readily separated ; morio by its dull black 

 body and wings, and stouter body ; jnoros7is by its yellowish 

 white antennae and more slender body ; cyaneus and 7iiger by 

 their black antennae. 



