406 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



NYSSON (ZANYSSON) AUREOBALTEATUS (Cameron). 



Nysson aureobalteatus Cameron, Trans. Amer. Ent. Soc, vol. 27, 1901, p. 313. 



The National Collection contains two males, one collected at 

 Tucson, Arizona, by F. H. Snow, the other from Paris, Texas, col- 

 lected July 11, 1904, by F. C. Bishopp. 



NYSSON (ZANYSSON) TEXANUS (Cresson). 



Paratope. — Cat. No. 1713, U.S.N.M. One of each sex. 



Besides the above-mentioned paratypes the National Collection 

 contains other Texas specimens from the Belfrage collection and a 

 male from St. Louis, Missouri, collected by Phil Rau under his 

 number 2456. 



NYSSON (ZANYSSON) PLESIA, new species. 



Closely allied to texanus but may be distinguished by the char- 

 acters given in the above key. 



Female. — Length, 6 mm. Anterior margin of clypeus with a broad, 

 nearly truncate, low process, which has sharp lateral angles; median 

 ridge between bases of antennae sharp, rather prominent; front with 

 separate, distinct punctures on a granular surface; tubercles between 

 lateral ocelli low, elongate, well separated; antenna slightly thicker 

 apically, the third joint not half as long as fourth, fourth and fifth 

 subequal, apical joint obtusely pointed and distinctly longer than the 

 preceding; dorsal surface of pronotum quadrangular, with a small, 

 acute tooth at the anterior angles; scutum impressed medianly, with 

 large, close punctures; scutellum with lateral margins reflexed, the 

 surface more coarsely sculptured than the scutum; dorsal aspect of 

 propodeum with a more or less distinct inclosure set off by a f oveolate 

 furrow, the inclosure with strong rugae; posterior aspect of propodeum 

 with the median area present but not sharply defined, V-shaped in 

 outline, lateral median areas rugose; tergites with distinct separate 

 punctures, closer and larger on anterior ones; pygidium narrowly 

 rounded apically, its surface bipunctate; sternites with large, distinct, 

 separate punctures. Black; mandibles and scape beneath piceous; 

 legs below coxae rufous; first three tergites with yellow spots later- 

 ally; body clothed with slightly golden pile, which is especially dense 

 on the face, pronotum, propodeum and base of first tergite and forms 

 a narrow shinning band on apical margins of all tergites; wings 

 dusky; venation dark brown. 



Male. — Length, 5.5 mm. Median carinae of posterior face of 

 propodeum obsolete, the surface without coarse sculpture; apical 

 tergite with five teeth, the median one the shorter. 



Type locality. — Louisiana. 



Type.— Cat. No. 23511, U.S.N.M. 



Described from two females (one type) and one male (allotype) 

 from Louisiana under C. F. Baker number 2392, and from a female 



