MONOGRAPH OF THE NORTH AMERICAN PROTOCTRYPID^.. 99 



Thorax <'l<>iijjate; the protUorax nearly twice as hm'^ as the nieso- 

 thorax; iiuisoiiotniu shoit, seiiiicircular, without furrows, the scutelhim 

 small; luetathorax hujie, longer than the prothorax, no» areolated. 



Front wings in ^ short, sptton-shaped, with two basal e»'lls, a stigma, 

 and a stigmal vein; 9 ajtterous. 



Abdomen short, ovate. 



Legs as in Aphclopus. 



A peculiar little genus, closely allied to Aphelopus, but rea«liiy dis- 

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

 uotal furrows. The genus is unknown in our fauna. 



APHELOPUS Diilniaii. 



Anal. Eut., pp. S-14 (1823); Forster Hym. Stud., ii, p. 91, 

 (Type A. melalriicuH l)alni.) 



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

 the oc<*iput slightly eniarginate; 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. 



Antenna^ 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 iu length, in S filiform, hairy, the scape 

 usually longer than the third, the last joint sometimes thi<'kened. 



Maxillary palpi h)ng, 5-jointed; labial palpi short, 2-jointed. 



Mandibles truncate at tips, with 3 small teeth. 



Thorax ovoid; the prothorax not <u- 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 SPE(;iES. 



IIeinl, thorax, aud abdomen black, tho head sometimes maculate 2 



Head and thorax black, the abdomen rufous. 



AutenuiB and legs yellow ? A. rufiventris sp. nov. 



2. Head with white or yellow marks anteriorly 3 



Head eutindy black. 

 Clypeus subtriau<jular. 



Lej{8 honey-yellow ; antenna' nearly as long as the body, brown, pilose, the 



scajie yellow ^ A. amekicani's Ashm. 



Clypeus truncate. 

 Legs dull rufous, the ])oaterior femora and tib^e fuscous or black; antenuie 

 much shorter than the body, l»lack, pilose (J . A. MELALKiicrsDalm. 



