MEXICAN IIYMENQPTERA. 33 



of fourth segmeut and the following entirely are black. Length 5 

 Hues. 



One % , three 9 specimens. (Sumichrast Coll, No. 13.) 



Genus STILPNUS, Grav. 

 Stilpnus teauicinctus, n. sp. 



% . — Black, shining J clypeus, mandibles, palpi, scape beneath, (re- 

 mainder of antennae wanting), tegulas, line before, another beneath, 

 eox^e and trochanters, basal fovas of second segment of abdomen, and 

 narrow apical and broader lateral margins of all the segments, yellow- 

 ish-white ; wings hyaline, iridescent, nervures honey-yellow; legs 

 honey-yellow, base of posterior coxae, base of their trochanters, tips of 

 their tibiae, and their tarsi, black. Head and thorax delicately punc- 

 tured, abdomen very densely and finely punctured; areolet of wings 

 5-angular, beyond which the cubital nervure is obsolete ; abdomen 

 elongate, narrow, depressed. Length 21 lines. 



One % specimen. 



MESOLEPTTJS, Grav. 



Body honey-yellow. 



Wings fasciate with dusky Sp. I 



Wings hyaline; tip of abdomen dusky 2 



Body honey-yellow and black. 



Occiput and bands on abdomen black 3 



Head, mesothorax and pleura black 4 



Head and thorax black, tip of abdomen black and white 5 



Body lemon-yellow, marked and banded with black 6 



Body black ; legs honey-yellow; head much swollen 7 



1. Mesoleptus calidus, n. sp. 



S . — Dark honey-yellow, or fulvous ; face, cheeks, broad annulus on 

 antennae, collar, tegulae, line beneath, scutellum, four anterior coxae 

 and trochanters, their tibiae, and posterior tarsi except extreme base 

 and apex, pale yellowish ; remainder of antennfe, except five basal 

 joints which are reddish, posterior margin of prothorax, sutures on 

 each side of scutellum, of pleura, spot at tip of metathorax, interme- 

 diate coxae within, the posterior pair beneath, tips of their tibiae, and 

 extreme tips of all the tarsi, black ; wings yellowish hyaline, iridescent, 

 a transverse cloud before stigma, another covering areolet, and the 

 tips of both wings, fuliginous, stigma luteous. Antennae as long as 

 body, slender, filiform ; mesothorax trilobed, very delicately punc- 

 tured ; scutellum flat; metathorax rounded, rugulose, with two trans- 

 verse, arcuate carinas, the surface smoother at base ; areolet 5-angular ; 

 legs long and slender; abdomen elongate, convex subclavate, very 

 slender at base, gradually thickened to the tip, finely and indistinctly 



rUANS. AMKR. ENT. SOC. ( 5 ) MAY, 1868. 



