202 CHARLES ROBERTSON. 



0<l.vneriis illinoensiM n. sp. 



9. — Clyi)eus rather sparsely and finely punctured, its ajjex narrow, nearly 

 trunrate, but with slight dentiform angles; two inconspicuous tubercles between 

 posterior ocelli and a depression behind them ; metathorax not sliining, rather 

 finely reticulated, the borders of the concavity rounded ; first segment without 

 any trace of a suture ; the insect rather coarsely punctured ; border of second seg- 

 ment of abdomen very slightly reflexed Black ; the yellow t)rnaments as fol- 

 lows: base of mandibles, arcuate line on summit of clypeus, sometimes inter- 

 rupted and forming two spots, often a subquadrate spot towards apex of clypeus, 

 the scape in front, spot between antenna?, spot in sinus of eye, a postocular spot, 

 two spots on prothorax, tegulte, their appendix, spot under wing, postscutellum, 

 often a spot on mesothorax, a round spot on each side of metathorax above, some- 

 times wanting, sometimes a spot or line on each side below, or the entire lateral 

 borders of metathorax, apical margins of abdominal segments 1, 2, 4 and 5, and 

 extreme sides of 3, an oblique spot on each side of 1, two spots on 2 above, and 

 sometimes two spots on ventral surface beneath, knees, tibiae and tarsi, the ante- 

 rior and middle femora more broadly yellow at tips. Length 7-9 mm. 



%. — Clypeus polygonal, almost impunctate, apex bidentate ; the tubercles be- 

 tween posterior ocelli more evident than in the female; apical margin of second 

 segment of abdomen a little more reflexed. The clypeus entirely, the mandibles, 

 flagellum beneath, a line between the antennae, and the lower borders of the eyes 

 in front, yellow; the marks on metathorax and the spot on mesothorax usually 

 wanting; the oblique spot on first segment often reduced to a dot; the second 

 segment of abdomen beneath has two large spots; the apical margin of sixth seg- 

 ment is often yellow, but sometimes only the first two segments have a yellow 

 border; the anterior and middle femora have the yellow marking extending 

 nearly to the base; the middle coxse, and sometimes the front and hind ones, 

 with a yellow spot. Length 7-8 mm. 



Carlinville, Illinois ; 18 9,5 S specimens. This may be only a 

 variety of 0. ocitleus. 



Odynerus zendaloides n. sp. 



% . — Belongs to the group of 0. acolhuus and sendalus. Head and thorax 

 coarsely punctured ; clypeus subquadrate, or rather transverse diamond shaped, 

 broader than long, coarsely punctured, the apex strongly bidentate; interval be- 

 tween ocelli strongly elevated, parted by a groove; thorax broad anteriorly, nar- 

 I'owing posteriorly; prothorax with crested, dentiform angles; postscutellum 

 short, truncate, strongly crested, with a sharp crenulate ridge, upper half of pos- 

 terior face strongly punctured, lower half smooth and shining; metathorax with 

 a broad, deep, circular, closely punctured concavity, the borders rounded, rather 

 sparsely and coarsely punctured ; articular spines simple, black ; abdomen spin- 

 dle shaped ; first segment cup shaped, coarsely punctured, a little constricted be- 

 fore apex ; second segment with smaller, more shallow punctures, except on apex, 

 where it is a little canaliculate. Black, with yellow ornaments as follows: cly- 

 peus, excei)t anterior border, scape in front, interrupted band on prothorax. tegu- 

 Ite, spot under the wing, more or less interrupted band, or two spots on scutel, 

 narrow borders of abdominal segments 1-3, l)order of 2 beneath, knees, tibia; and 

 tarsi ; the color of legs more reddish. Length 8-9 mm. 



Carlinville, Illinois; 3 $ specimens. 



Puinpiliis illiiioeusiii n. sp. 



9. — Velvety black, opaque, abdomen sometimes with a puri)lish reflection: 



