AMERICAN HYMENOPTERA. 199 



Odyiieriis liis^trioiialiN n. sp. 



9 . — Of the same size and structure of 0. histrio 9 . The ornaments are the same, 

 but yellow instead of fulvous or red. The arcuate line at summit of clypeus some- 

 times broken in two, or entirely wanting; metathorax black; first segment of abdo- 

 men black, sometimes with an oblique line or spot on the sides; two yellow spots on 

 second segment ; border of fourth segment usually — of third sometimes — more or 

 less yellow; legs fulvous, femora largely blackish basally. Length 8-10 mm. 



%, . — Also of the size and structure of 0. histrio % . The ornaments yellow. 

 There are two yellow spots on second segment, and the borders of third and 

 fourtli segments sometimes more or less yellow. Length 7-10 ram. 



Carlinville, Illinois; 16 9 > ^^7 ^ specimens. Inverness, Florida ; 

 3 <? specimens. 



This species is closely related to 0. histrio, the name being in- 

 tended to indicate that relation. It may be a mere variety of that 

 species. In both species the posterior ocelli have a pair of tubercles 

 between them, more evident in the males, where— seen from the 

 side — the near tubercle appears above the ocellus, the other con- 

 ceals the ocellus of the other side. In the Florida Odyneri there 

 seems to be a general tendency for the ornaments, as well as the 

 ground color of the base of abdomen and base of legs, to become 

 fulvous or red. 



Odyiieriis clypeatus n. sp. 



9 . — Clypeus rather strongly puncto-striate, its apex regularly truncate, about 

 one-third the total width of clypeus; vertex with a concave depression behind 

 ocelli ; head and thorax rather strongly and conttuently punctured ; metathorax 

 with a broad, heart-shaped concavity, notched behind postscutellnm, carinate in 

 the middle, with regular lateral, radiating lines; above the concavity shows some 

 coarse reticulations, the edges sharp but irregular; above the metathorax is 

 coarsely reticulated ; the first segment of abdomen presents a suture on its ante- 

 rior face, which is followed by a fluting, so that the segment appears constricted 

 at the edge of the truncation ; beyond the fluting the segment is finely roughened, 

 coarsely and confluently punctured ; the second segment also finely roughened, 

 but less coarsel.y and strongly punctured. Black ; a dot on mandibles, sometimes 

 wanting; more or less extensive, sometimes interrupted, arcuate line on summit 

 of clypeus, line on scape, spot between antenna?, spot in sinus of eye, postocular 

 spot, two spots on prothorax, tegulse, spot under the wings, postscutellnm, usually 

 the lower borders of metathorax, borders of first and second segments of abdo- 

 men, two spots on second segment, borders of segments three and four, more or 

 less, and the knees, tibite and tarsi yellow; the tarsi a little darker. Length 

 9-10 mm. 



'J, . — The cl.vpeus more broadly truncate; the mandibles, clypeus, lower border 

 of orbits, spots on coxfe, anterior and middle femora more extensively, and bor- 

 ders of segments 1-6 of abdomen yellow. The flagellum beneath and the hook 

 fulvous. Length 7-8 mm. 



Carlinville, Illinois; 8 9 , 51 ^ specimens. 



TRANS. AM. llNT. SOC, XXVII. APKIL, 1901. 



