1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 653 



Described from a single male specimen. 



This species seems to be entirely distinct from all of the other de- 

 scribed forms in our fauna. 



Subfamily DIOSPILINiE. 

 PEOMACHUS Marshall. 

 Promachus sanguineiventris n. sp. 



Female.— Length, 7 mm ; ovipositor, 5| mm . Head, antennae, thorax, legs, 

 and ovipositor, black ; abdomen sanguineous, attached to the superior 

 margin of the thorax ; the tibiae covered with fuscous pile. The head 

 is smooth, polished; face punctulate, pubescent; antennae 34-jointed, 

 the length of the insect; thorax smooth; parapsidal grooves deep, 

 broad, smooth, converging and meeting at about half the length of the 

 mesonotum ; the middle lobe small and prominent, ending in a carina 

 posteriorly ; mesopleura with coarse, deep foveae on the disk and along 

 the lower and posterior sutures ; metathorax coarsely rugose, yellow- 

 ish-red towards apex; abdomen oval the length of the thorax, the 1st 

 segment with four black keels — two laterals and two on the disk. 

 Wings black; the stigma, costae, median, submedian, and basal veins, 

 black ; other veins brown ; tegulae yellowish. 



Habitat. — Missouri. Collection C. V. Eiley. 



Described from one specimen. 



This species might be confused with Promachus saperdcv Eiley, but 

 its larger size and different sculpture ought to readily distinguish it. 



Promachus rubriceps n. sp. 



Male. — Length, 3i mm . Head red ; stemmaticum and anteriorly to 

 base of antennae, the occiput, and hinder margins of cheeks to base of 

 mandibles, with the tips of mandibles, black; two basal joints of an- 

 tenna', palpi, and legs, honey-yellow; flagellum of antennae, coxa', 

 thorax, and abdomen, black. The head in front of the ocelli has deep 

 grooves for the reception of the antenna! scape, separated by a sharp 

 ridge extending between the base of the antennae; the face is minutely 

 punctulate, covered with white sericeous hairs ; antenna^ 27-jointed, the 

 scape long; sides of thorax rugose covered with long, white hairs ; the 

 parapsidal grooves broad, reticulate with coarse punctures, the middle 

 lobe with a distinct carina posteriorly ; the scutelluui has a deep fovea 

 at base, in the bottom of which are some raised lines; metathorax 

 rugose ; abdomen long, ovate, subpetiolate, attached to the upper pos- 

 terior margin of the thorax, much above the base of the posterior coxa', 

 and strongly suggestive of an affinity with the Evaniidce. Wings hya- 

 line ; the venation as in previous species. 



Habitat. — Washington, D. C. 



Described from two specimens, labeled No. 25GG , reared February 

 14, 1884, from Sternidius alpha, living in the pith of Rhus glabra. 



