2T8 . HYMENOPTERA OF AMERICA. [PART I. 



97. O. formosiIS Sauss. — 0. Cordova; conformis, at metathorace dis- 

 tincte biileutato ; abdomine magis couico ; niger, inandibulis, clypeo, 

 scapo, capitis maculis, fulvis ; pronoto, tegulis, macula subalari, maculis 

 2 scutelli, post-scutello, metanoti angulis, abdominis segmentoruin 

 marginibns (primi liinbo utrinque cum fascia obliqua conjuncta), pedi- 

 busque, flavis vel aurantio-variis ; alis subferrugineis, apice griseis. 



Odyn. formosus Sauss. Rev. de Zool. XXII, 1870, 59, 15, Q. 



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



9. Size and form nearly as in 0. Cordovse, but the metathorax 

 lias its angles on each side produced into a distinct tooth ; the 

 cavity not at all limited, not margined superiorly on each side 

 by a little oblique ridge ; the abdomen quite conical, the first 

 segment as broad as the second, and more sharply truncate at 

 base ; the punctured marginal band of the 2d segment decidedly 

 impressed, a little widened in the middle. 



Black ; mandibles and feet rufous or orange. Clypeus, frontal, 

 ocular and post-ocular maculae, yellow or rufous. Antenna? 

 black ; scape yellow, a little obscure above. Prothorax, a spot 

 under the wing, tegulse, two spots on the scutel, post-scutel, 

 angles of metathorax, and margin of all the abdominal segments, 

 yellow or rather orange ; the fasciae wide ; that of the first seg- 

 ment fusing into two oblique lateral bands, which make nearly 

 an anterior interrupted fascia, sometimes rufous. Anus rufous 

 or yellow. Wings rather ferruginous; the apex clouded. 



Var. A.black spot on the posterior angles of prothorax. — A 

 yellow fascia on scutel. 



Bess. a. cliff. — This does not seem to be a variety of 0. Cor- 

 dovse. It has the same livery as 0. Boscii, turpis, molestus, 

 but a quite differently shaped metathorax; it is also smaller and 

 more slender, nearly one-half smaller than the first. It resembles 

 0. sulfureus, but its livery is not so rich nor so pale ; the clypeus 

 is not so much produced, the size smaller. It is allied closely 

 also to 0. annulatus, although smaller and with a metathorax 

 not so much flattened behind. Comp. also 0. annulatus (Mexi- 

 can variety). 



Hab. The temperate parts of Mexico. Oriental Cordillera 4 

 ? (Sumichrast). 



98. O. specta"bilis Sauss. — Niger, gracilis ; capite, tliorace abdomi- 

 nisque segmentorum 2 l -5' margin e dense punctatis; metanoto rotun- 

 dato, utrinque valde angulato ; abdomine subcouico ; clypeo, antennis 



