96 E. T. CRESSON. 



anterior tarsi dusky ; abdomen elongate, siibdepressed, apioal margin of second 

 segment, whole of the third, the fourth except sides, and the base of the fifth, 

 rufo-ferruginous. Lengih 2i lines. 

 Hab. — Hudson's Bay Territory, {Coll. Mr. E. Norton.) One % specimen. 



Mesoleptus elong-atus. — 9 . Elongate, black, covered with a thin, short, whit- 

 ish, sericeous jiile ; head transverse, wider than the thorax; face flat, dull yel- 

 low, with a square black sjiot beneath the antennse; clypeus, mandibles, except 

 tips, and palpi, yellow; antennse about as long as the bodj', slender, yellow, 

 the basal joint more or less blackish above, the apical joints sometimes dusky; 

 thorax short and stout; mesothorax trilobed, smooth and polished; metatho- 

 rax rugose down the middle; tegtilfe pale yellow; wings long, n.irrow, hyaline, 

 iridescent, uervures luteous, stigma very narrow, areolet petiolated, triangular, 

 often much reduced, sometimes subobsolete ; legs slender, the two anterior 

 pairs yellow, their coxse paler, posterior pair honey-yellow, their trochanters 

 and tarsi jaale yellow, tips of their tibiae blackish; abdomen long, olavate, pe- 

 tiolated, convex, shining, obscure honey-yellow, first segment one-half longer 

 than the second, sublinear, the stigmatic tubercles prominent, placed a little 

 beyond the middle; apex subcompressed, the fifth and following segments 

 black. Length 5 lines. 



The % has the face of a brighter yellow, the basal joint of antennas beneath 

 is pale yellow, the posterior coxfe are more or less tinged with dusky, and the 

 a})ex of the abdomen is not subcompressed. 



ITab. — Massachusetts. One 9; three '^ , specimens. 



M. inceptus. — %. Head transverse, black, finely pubescent; face, clypeus, 

 mandibles except tips, sometimes a spot beneath the ej'es, and the palpi, lemon- 

 yellow; the yellow of the face extends slightly upwards on each side of anten- 

 nte; antennse about as long as the body, slender, fulvous, the basal joints more 

 or less blackish above, the scape lemon-yellow beneath: thorax shining, finely 

 pubescent; mesothorax trilobate; scutellum elevated, deeply excavated at base, 

 sometimes with a yellowish spot on the disk; tegulaj, spot before and a short 

 line beneath, and sometimes a spot behind each anterior coxa, lemon-yellow; 

 metathorax shining, with a narrow rugose space down the middle, sometimes 

 bounded on each side by a sharp carina; wings hyaline, iridescent, nervures 

 brown, stigma paler, areolet small, sometimes minute, triangular, jietiolated ; 

 legs slender, the coxfe, trochanters and four anterior legs lemon-yellow; poste- 

 rior coxse abov-e, their femora, tibiae and tarsi more or less honey-yellow, base 

 of their tibise paler; sometimes the jJosterior coxse are ferruginous, dusky at 

 base beneath ; abdomen elongate, clavate, very finely pubescent, especially at 

 tip, dark honey-yellow, often more or less ferruginous; basal segment petiolate, 

 slightly dilated towards the tip, with two sharp carinse above extending from 

 the base to beyond the prominent stigmatic tubercles which are situated slight- 

 ly beyond the middle, black, the apex ferruginous or honey-yellow; the second 

 and following segments, especially the aj^ical ones, are sometimes slightly stain- 

 ed with fuscous, sometimes immaculate; the second segment occasionally has 

 a blackish stain on each side at base; one dark specimen has the antennte dus- 

 ky above, especially at tips, the scutellum tinged with rufous, the posterior 

 coxse black, with a rufous stain above, and the extreme tips of their femora, 

 tips of their tibise and their tarsi, dusky, the abdomen is blackish, with the 

 apex of the second and third segments and the two following segments entirely 

 dull rufous. Lensrth 4 — 4-1 lines. 



