PTEROCIIILUS. 311 



long hair. Labial palpi very large, strongly pectinate with long 

 hair. 



Clypeus convex, punctate, truncate and rather bituberculate at 

 tip. The whole body densely punctured and clothed with woolly 

 ferruginous hair. Thorax globular, scutel and post-scutel parted 

 by a groove, anteriorly rather carinated; nietathorax quite 

 rounded, finely strigate in the middle. Abdomen regularly 

 ovate, subsessile ; second segment beneath with a transverse 

 carina at base. 



Black. Mandibles and the first two joints of the antenna', 

 ferruginous. Clypeus yellow or ferruginous, with two black 

 marks below, laterally. A post-ocular line, two spots on pro- 

 thorax and a line on post-scutel, yellow or rufous; tegulae rufous. 

 Abdominal segments all margined with yellow; the margins 

 twice notched ; that of the 2d segment narrower, rather sinuous. 

 The 2d segment having on each side also a large rufous separate 

 spot, and the 1st segment two similar lateral spots, but placed 

 on the yellow margin. Anus marked with yellow. Feet ferru- 

 ginous, black at base. Wings smoky; the anterior margin as far 

 as the stigma, ferruginous. 



Var. Post-scutel with an interrupted yellow line, or black. 



JRess. a. diff. — This differs from the African species by its not 

 salient post-scutel, its nietathorax not excavated, but small, 

 rounded, convex, only slightly channelled in the middle; even 

 its lateral ridges quite blunt. It most resembles PL biglumis 

 Sauss., but the clypeus is more convex and not notched. It 

 differs from PL mexicanus by its globular thorax, nearly as wide 

 as long. 



Rah. Mexico, I caught one 9 near Orizaba. 



4. Pt. quiliqiie-fasciatlis Say.— Niger, mandibulis emarginatis, 

 clypeo, antennarum scapo, prothorace, tegulis ; uietanoto utn'nque pedi- 

 busque, ferrugineis ; macula subalari maculis 2 scutelli, post-scutello 

 et abdominis fasciis quinque, flavis ; seginentis 1°, 2° utrinque macula 

 ferruginea. 



Pt. 5-fasciatus Say, in Long's Exp. to the sources of the St. Pet. Riv., 

 II, Supp. 70 (1824).— Sauss. Et. Vespid. I, 248, 13; III, 323.— 

 Say's Entomol. (Lb Conte). I, 234. 



Rhygclrium 5-fasciatum Say, Bost. Journ. 1, 1837, 385. — Sauss. Et. Vespid., 

 I, 118.— Say's Entomol. (Le Conte), II, 765, 2. 



Total length, 20 mm. 



