isely: eumenid^ of Kansas. 249 



^ . Smaller. Clypeus polygonal, yellow, wider than long, truncate 

 on its anterior border, offering a very small tooth on each extremity; its 

 anterior portion a little prolonged, so that the polygon is not regular; 

 hook of the antennse black or ferruginous; mandibles and ornaments of 

 the head yellow or orange; a red dot on the flanks before the tegulae; often 

 the posterior border of the prothorax red. Fifth abdominal segment often 

 bordered with yellow. 



Habitat: "The United States, particularly the south," writes De 

 Saussure. He records specimens from New York, Hlinois, Kansas, and 

 Tennessee. Both Hartman and Cameron have recorded specimens taken 

 in Texas. 



O. annulatus Say. 



A. annulatus Say; Long's Sec. Exp., Append. 29, II, 348. 

 Rhynchium annulatum Say; Bost. Journ. I (1837), 351, 4. 

 0. bairdi Sauss..; Revue Zool. X; 1858. 

 O. annulatus Sauss.; Syn. Am. Wasps Sol., 273-27; 1875. 



o . Total length, 12 mm.; wing, 10 mm. 



J . Total length, 10 mm.; wing, 8 mm. 



. A medium-sized, rather slender, largely rufous wasp with coarse 

 and dense punctures. This wasp closely resembles O. arvcnsis in form, 

 from which it differs chiefly as follows: somewhat smaller and more 

 slender; clypeus broadly pyriform but not as broad as that of O. arvensis; 

 surface of clypeus simply punctate. Head rufous, except vertex, base of 

 scape and flagellum, which are black; a spot on anterior portion of pro- 

 thorax scutellum, a spot on scutum, tegulae, yellow ; rest of thorax rufous, 

 except scutum and sides of mesothorax, which are black, and a spot 

 below tegulae, postscutellum, and a spot one each side on the metathorax 

 above, and sometimes the anterior margin of the prothorax, part of the 

 tegulae and spots on the scutellum, which are yellow; usually there is a 

 rufous spot in middle of scutum. Abdominal segments rufous, 1-5 

 bordered with yellow, the first having its border widened on each side, 

 usually extending forward to the anterior margin of the segment; yellow 

 maculas on sides of second segment; often a black spot on the middle of 

 the dorsum at the base of each segment. Legs rufous. Wings light 

 smoky. 



1 . Clypeus broader than high, more regularly octagonal ; its an- 

 terior margin straight, having two distinct teeth on either side. Man- 

 dibles, clypeus, a triangle on the forehead, and a sinus of the eyes, a line 

 on the scape, bright yellow; hook of the antennae and postocular spots 

 rufous. Otherwise as female. 



This species is very variable in size and in coloration. I have speci- 

 mens that measure 15 mm. in length. In coloration the Kansas forms 

 vary particularly in the amount of black on the abdomen. In many 

 specimens the black entirely replaces rufous on the third and following 

 abdominal segments. De Saussure describes three varieties — a "black 

 variety," a "rufous variety," and a "Mexican variety" in which yellow 

 predominates. The Kansas forms are nearly like the "rufous variety." 



Habitat: According to De Saussure, this species is found on the 



