1849.] ' 203 



The Committee to whicli was referred the following paper by Prof. 

 Haldeman reported in favor of publication in the Proceedings. 



On several nevj Hym.eiioptera of the genera Ampiclex, Sigalphus, Chelonus and 



Dorylus. 

 By S. S. Haldeman. 

 AMPULEX J urine. 



§ Discoidal nervure having its origin near the posterior extremity of Romand's 

 subdiscoidal recurvent nervure (discoidal of Shuckard), it curves forward and ter- 

 minates in the cubital nervure beyond the 1st transverso-cubital near the middle 

 of the 2d cubital area. 



A. PENSYLVANTCus Hald. Black somewhat glossy, sparsely punctulate ; an- 

 tennae fuscous; mandibles and tibiae dull rufous, tarsi paler: pronotum with tiie 

 medial line impressed ; alae hyaline, external third dusky but becoming colorless 

 towards the apex and centre, basal third varied with pale dusky : metanotum 

 exarate, with 9 longitudinal ridges, between which there are short transverse 

 sulci : abdomen polished. 5 lines long, expanse about the same. 



Inhabits woods, taken in S. E. Pensylvania in September. On account of the 

 obliquity of the median recurrent nervure (Romand), the interior angles of the 

 1st discoidal and 1st cubital are acute, and similar. Radial and cubital nervures 

 nearly parallel, the latter rectilinear. 



SIGALPHUS Latr. 

 (triaspis Holiday.') 



S. TIBIALIS Hald. Dark fuscous : head, disk of the thorax, middle of the 1st 

 and 2d segments of the tergum, exserted ovipositor, beneath and feet,/a;vo?/5 : 

 eyes black ; antennae flavous, base and apex pale fuscous ; vertex, a macula 

 behind the eyes, and the posterior tibiae and knees, fuscous. 2 lines long. S. E. 

 Pensylvania. The flavous portion of the abdomen extends from the base to the 

 2d impressed transverse line. 



CHELONUS Jurine. 



§ Eyes with hairs ; 3 cubital areae, 2d triangular, with the external apex trun- 

 cate ; abdomen coalite, without sutures. 



Ch. basilaris Say. Bost. J. nat. hist. I, 26G. S. E. Pensylvania, in June. 



Ch. sobrinus Hald. Black, scabrous : abdomen with a subbasal flavous fascia 

 interrupted in the middle; surface minutely scabrous with a tendency to become 

 sulcate towards the base : antennae dark fuscous with the two basal articulations 

 rufous : palpi and feet pale flavous ; medial femora, and apex of the tibiae pale 

 fuscous ; posterior coxae, femora and tibiae (except the base of both) dark fus- 

 cous : tarsi obscure toward the apex, posterior ones entirely so. 2 lines long. S. 

 E. Pensylvania, in June. 



§Eyes with hairs, 3 entire areae, 2d irregular, abdomen coalite with 1 indis- 

 tinct suture ; metathorax with a spine upon each side. 



Ch. lunatus Hald. Black, scabrous, basal third of the abdomen pale flavous; 

 tergum with numerous longitudinal sulci: mandibles and basal articulation of the 

 antennae rufous: feet flavous, apex of the tarsi black; exterior half of the poste- 



