216 HTMENOPTERA. 



sutures of the mesonotum not very distinct ; scutellum broader than long, smooth and 

 shining ; the tegulae, prosternura, the edge of the pronotum in the middle, the pleural 

 tubercle, a large mark (broader than long) on the mesopleura, a much smaller mark 

 immediately beneath the hind wings, an oblique longish mark on the metapleurse, the 

 scutellum (except at the apex), the carina? in front of it, the metathoracic spines, and 

 the space immediately surrounding them, yellow. Upper transverse keel on the meta- 

 notum distinct, the sides of the metathorax rugose ; above the transverse keel finely 

 punctured, below it obliquely striated, the striations (which are large) converging towards 

 the centre ; tubercles blunt, a little longer than broad. Petiole and postpetiole smooth 

 and shining, impunctate ; yellow, beneath and a large mark in the centre black ; the 

 postpetiole not clearly defined from the petiole, and becoming gradually thicker towards 

 the apex. The rest of the abdomen semiopaque, finely punctured ; the second and third 

 segments narrowly banded with yellow at the apex, the band on the fourth interrupted 

 in the middle, the fifth and sixth yellow at the sides, the seventh entirely yellow, except a 

 black mark in the centre, and the eighth segment has a small black mark at the side ; the 

 ventral surface is entirely yellow. The four anterior coxae and trochanters are yellow, 

 except a round black mark on the outer side of the former ; the hind coxae are black, 

 broadly yellow at the base and apex ; the anterior femora are yellow beneath in the 

 middle ; the anterior tibiae yellow, black at the base and apex ; the middle and posterior 

 tibiae broadly yellow at the base ; the anterior tarsi almost entirely black ; the apical half 

 of the basal joint of the middle tarsi is yellow; the posterior tarsi are yellow, broadly 

 black at the base (especially) and apex. The wings are slightly smoky at the apex ; 

 areolet open at the apex, nearly square, angled where the recurrent nervure is 

 received. 



5. Mesostenus vividus. (Tab. x. fig. 18.) 



Niger, flavo-maculatus ; ore, facie orbitisque, flavis ; pedibus flavis, femoribus nigro-lineatis, tibiis tarsisque,. 



Mvis ; abdominis basi segmentoque 2° laterali, flavis ; alis hyalinis, stigmate nigro. $ . 

 Long. 11 millim. ; terebra 3*5 millim. 



Hah. Guatemala, Zapote (Champion). 



Antennae longer than the body, stout, microscopically pilose. Head punctured 

 roughly on the top ; yellow, except behind and the centre of the vertex ; mandibles 

 edged with black. Thorax coarsely punctured ; the scutellum punctured, longer than 

 broad, the sides rather abrupt. Pronotum laterally, coarsely, longitudinally striated* 

 A broad line on the edge of the pronotum, the tegulae, the scutellar carina?, the scu- 

 tellum above, the postscutellum, the mesopleura almost entirely, a mark beneath the 

 hind wings, a large, somewhat triangular, mark on the metapleurae, and a large mark 

 on either side covering the tubercles, yellow. Metathorax above the transverse keel 

 (which bends sharply up in the middle) smooth, shining, impunctate ; the rest coarsely 

 punctured ; tubercles long, stout, straight. Petiole and postpetiole shining, impunc- 



