338 PI:()('1<:PJI)IN(JS OF THE NATIONAL MUSEUM. vol. xxxi. 



verse cubital vein of the fore wing is usually quite oblique to the 

 .second; legs more sericeous than in the female; inner tooth on the 

 claw smaller than the others. 



Lemjth. — Females, 18-2S mm.; males, 18-20 mm. 



This insect, which is the largest known American Priononyoc^ has 

 not hitherto been reported from North America, the localities given 

 for previous captures being Brazil and Venezuela. I have studied 

 specimens from the hist-named country and also from C.'ordoba, Argen- 

 tina, and three (a female and two males) taken at Hill Williams Fork, 

 Arizona, in August, by Prof. F. H. Snow, which bring this species 

 within the geographical limits of this paper. If Priononyoc Imrma 

 Cameron should prove to be the same, Mexico could be added to the 

 habitat, thus giving a continuous northern extension from Venezuela 

 to Nevada for the species, as in the collection of the American F^nto- 

 mological Society is a female 28 mm. long, from Nevada, marked 

 ''magna Cr." (a manuscript name), and a male 22 mm. long, from 

 Mexico. 



CHLORION (PRIONONYX) ATRATUM (Lepeletier). 



Sphe.r lahrosa Harris, Cat. An. Mass., 2d ed., 1835, p. 588, {nonten nudum.) 

 Sphex atrata IjEPEhEriER, Hist. Nat. Ins. Hyin., Ill, 1845, p. 355. 

 Priononyx atrata Smith, Cat. Hym. Brit. Mas., IV, 1856, p. 266. 

 Priononyx atrata CREi^»ON, Trans. Am. Ent. Soc, IV, 1872, p. 213. 

 Prionony X brunnipes CREssoti, male, Trans. Ani. Ent. Soc, IV, 1872, p. 213. 

 Priononyx atrata Coquillett, Rept. U. S. Dept. Agr., 1885, 1886, p. 298. 

 Sphex (Harpactopus) atratus Kohl, Ann. natur. Hofmus. VVien, V, 1890, p. 357. 

 Priononyx atrata Coquillett, Ins. Life, VII, 1894, p. 228. 



Priononyx atrata Peckhams, Wise. Geol. and Nat. Hist. Surv., Bull. 2, 1898, p. 

 171, pi. XIV, fig. 4. 



The type of hrunnipcs Cresson is Cat. No. 1691 of the U. S. National 

 Museum in Washington. It is not in good condition, the interior 

 having been eaten out by museum pests and the terminal abdominal 

 plates destroyed. 



Female. — Robust, black; with fuliginous wings having a violet 

 reflection. 



Head. — Stout, quadrangular when viewed from above, the frons some- 

 what excavated between the eyes; cl3q")eus broader than long, arched 

 in the middle, its anterior margin extended laterally' beneath the ej'es 

 to the base of the mandibles; turning abruptly downward near their 

 inner margins, then running nearly straight across the front, this mar- 

 gin bearing quite a deep notch at its middle, above which is a pro- 

 nounced depression; surface beneath the eyes smooth, as is also the 

 slightly reflexed rim; the remainder very closel}', mimitely, and also 

 sparsely, coarsely punctured, with more or less white pubescence and 

 long, rather stout black hairs; near the margin of the central notch 

 the clypeus is tinged with ferruginous; frons minutely punctured and 

 with a few coarser, scattered punctures; sparsely white pubescent at 



