358 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. VII. 



congeneric with the true type of the genus and will in all probability 

 have to be renamed, no term now in the literature apparently being 

 available. 



When the genus Pcecilochroa was proposed by Chevrolat (Me'moire, 

 1876, p. 5), no type was indicated, but Clerus cyanipennis Klug 

 (= dasytoides White), thoracicus Oliv., and haagi nov. sp. were 

 placed as members of the genus. Gorham subsequently designated 

 the first of the above mentioned species as the type; and as cyani- 

 pennis is a Clerus (as characterized by Schenkling) and, like haagi 

 a synonym of thoracicus the term would be available for use, were it 

 not for the fact that it is a homonym, being antedated by Poscilochroa 

 W'estring (Bemerk. u. d. Arach., Abh., v, Thorell, 1874). 



Clerus viduus Klug. 



Clerus viduus Klug, Abh. Berl. Akad., 1842, p. 297. 



Clerus erythrogaster Spin., Mon. Cle"r., i, 1844, p. 272. 



Clerus viduus Spin., Mon. Cle"r., Atlas, 1844, pi. 27, fig. 3. 



Clerus rufiventris Chevr., Rev. et. Mag. Zool., 1843, p. n. 



Clerus cuprescens Gorh., Cist. Ent., 1876, p. 81. 



This species, which was stricken from our lists upon the supposi- 

 tion that it was not a member of our fauna, was taken at Alpine, 

 Texas, June, 28-30, 4,400-6,000 ft. el., by Prof. Wickham. A 

 specimen sent the author for identification is 8 mm. in length. 



The form is that of sphegeus; the color is purpurescent, slightly 

 aeneous; the meso-, metasternum, and abdomen are red, the legs 

 black, knees, femora at base, and tibia? at apex narrowly red, basal 

 joint of antennae beneath and palpi reddish. Clothed with rather 

 short, fine, recumbent, ashy hairs and long, sparse, erect, black hairs; 

 upon each elytron two large somewhat arcuate spots in which the ashy 

 hairs are wanting. The first of these subbasal, extending from near 

 the flanks nearly to the suture, the other behind the middle attains 

 the flanks but not the suture ; the elytra are conjointly rounded at 

 apex; the legs are clothed with rather short, grayish white, and 

 longer erect black hairs ; the abdomen and body very sparsely clothed 

 with long, very pale hairs. 



The labrum and the abdomen above are reddish, the color of the 

 legs is quite variable. Spinola merely describes the legs as red, while 

 Klug in the original description states that they are black, with the 

 intermediate femora above and the posterior femora and tibiae totally 

 red. In other descriptions the legs are said to be red, with the tarsi 

 fuscous. 



