MONOGRAPH OF THE NORTH AMERICAN PROTOCTRYPID^. 99 



Thorax elougate; tlio prothorax iieaiiy twice a.s long as the meso- 

 thorax; mesonotum short, semicircular, without furrows, the scutellum 

 small; metathorax large, louger than the prothorax, not areolated. 



Front wings in A short, spoon-shaped, with two basal cells, a stigma, 

 and a stigmal vein; 9 apterous. 



Abdomen short, ovate. 



Legs as in Aplielopus. 



A peculiar little genus, closely allied to Aphelo2)us, but readily dis- 

 tinguished by the long and broad protliorax and the absence of meso- 

 notal furrows. The genus is unknown in our fauna. 



APHELOPUS Dalmau. 



Anal. Eut., pp. 8-14 (1823); F.irster Hym. Stud., ii, p. 91. 

 (Type A. melalciivus Dalm.) 



Head transverse, wider than the thorax, the vertex broad, convex, 

 the occiput slightly emarginate; eyes large, oval, hairy; ocelli 3 in a 

 triangle, but widely separated, the lateral ocelli nearer the margin of 

 the eye than to each other. 



Antenme inserted just above the clypeus, 10-jointed, in 9 shorter 

 than in the S , subclavate, the scape very short, scarcely longer than 

 the second, the others variable in length, in S filiform, hairy, the sc^Tpe 

 usually longer than the third, the last joint sometimes thickened. 



Maxillary palpi long, 5-jointed; labial palpi short, 2-jointed. 



Mandibles truncate at tips, with 3 small teeth. 



Thorax ovoid; the prothorax not or scarcely visible from above; 

 mesonotum as broad as long, convex, without furrows; metathorax 

 not longer than high, rounded posteriorly. 



Front wings with a large oval stigma, a short stigmal vein and two 

 basal cells, which are often subobliterated on account of the paleness 

 of the nervures. 



Legs moderate, the femora not obclavate, the tarsi simple in both 

 sexes. 



TABLE OF SPECIES. 



Head, thorax, aud abdomen black, the head sometimes maculate 2 



Head and thorax black, the abdomen rufous. 



Antenna, and legs yellow 9 A. rufiventris sp. uov. 



2. Head with white or yellow marks anteriorly o 



Head entirely black. 

 Clypeus subtriangular. 

 Legshouey-yellow; antennae nearly as long as the body, brown, pilose, the 



scape yellow ^ A. americanus Ashm. 



Clypeus truncate. 



Legs dull rufous, the posterior femora and tib* fuscous or black; antenna 

 much shorter than the body, black, pilose S - A. mei^aleucus Dalm. 



