346 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xx.y. 



and seventh ventral a])dominul plates each have a hroad, ({iiite deep 

 excavation (tig. 11). 



The extreme difficulty in separating these species, particularly from 

 North Carolina, Florida, and elsewhere in that region, has frequentl}' 

 raised the question during their study whether the}' are not really the 

 the same, with dimorphic males. 



None of the specimens 1 have studied agree with C. exisus Kohl, 

 though several were taken in the same locality as his specimens of 

 this species. He separates cxtistis from hifoveolatum by comparative 

 measurements of different parts of the bod}^ and in some cases I have 

 found individuals which in some of these measurements agreed with 

 those given for exclstis^ but in the others agreed with those given for 

 hlfoveolatum. in consequence I must place C. excisus Kohl as one of 

 the species unknown to me, though with some question as to its being 

 a valid species. 



Ilhistrations of Ohlorion thomx, are given in the Insect Book, Plate 

 Vll. fig. G, and Plate XI, fig, 7, the latter figure being wrongly named. 



CHL.ORION (PRIONONYX) BIFOVEOLATUM (Taschenberg). 



Priononyx (lionuc var. Saussure, Reise. d. Novara, Hyin., 1867, p. 43. 

 Priononyx bifovcolata Ta^chenbekc;, Zeits. f. d. ges. Naturw., XXXIV, 1869, p. 



408. 

 Priononyx thonue Fatton, Proc. Bos. Soc. Nat. Hist., XX, 1880, p. 384. 

 Priononyx canadensis Provancher, Addit. faun. p]nt. Can., 1889, p. 258. 

 Sphex (Ilarpactopus) bifoveolatus Kohl, Ann. natur.- Hofmus. Wien, V, 1890, p. 



360. 

 Sphex (Priononyx) bifoveolatus Fox, Proc. Arad. Nat. Sci. Phila., 1897, p. 378. 



Black except the abdomen, which is varied with ferruginous; well 

 clothed with gray hairs; wings quite hyaline to somewhat fuliginous. 



Female.- — Head large, broader than the distance between the outer 

 edges of the teguhe, slightl}' quadrangular, the cheeks being quite full 

 above; frons slightly excavated between the eyes; clj^peus and frons 

 pale yellowish pubescent to the ocelli, least so in the middle; clypcus 

 broad, square Ijelow, with a deep central depression of the anterior 

 edge, which is slightly reflexed; its surface with scattered punctures 

 and bearing quite long, pale yellow hairs, true also of the frons; ocelli 

 surrounded b}' sutures inclosing them in a triangular area; frontal 

 suture evident; lateral ocelli about equidistant from each other and 

 from the eyes; vertex sparsely, minutely punctured, whitish or gray- 

 ish sericeous in some lights, with numerous medium long, gray hairs; 

 cheeks quite broad above, narrowing rapidl}' below, gra}' sericeous, 

 with scattered punctures more abundant and larger below, with scat- 

 tered gray hairs above, longer and more abundant below; inner edges 

 of eyes very slightly nearer at the clypeus than at the vertex, but 

 their lower portion parallel; antennae black, scape slightly gra3dsh 

 sericeous and with a few gray hairs; filament slightly sericeous, their 



