^o-S-] PATTON ON ACULEATE HYMENOPTERA. 357 



erect fringe of long curved bristles; the eighth ventral segment is nar- 

 rowed towards the apex, extends slightly beyond the seventh dorsal, 

 and is emarginate at the tip. 



In the i of E. superhiis and E. canaUcuIatns the clypeus is well sepa- 

 rated from the eyes, and the median lobe has the central tooth longest; 

 in the (? of E.fulvipcs and E. cbujnJatus the side lobes almost touch the 

 eyes and the median tooth does not extend beyond the others ; but in 

 the form of the tip of the abdomen E. superhus S stands alone and the 

 three others agree. 



There are three distinct sections in the genus Eueerceris represented 

 by zonatus, canalicidatus, ^n^ fulvipes. To the first belong also nvperhtis 

 and laticeps. 



22. EUCERCEEIS LATICEPS CrCSS., 5 . 



This specimen differs from the description of the 9 from Massachusetts 

 in the following particulars : there is no whitish line on the collar, the 

 ■^^ellow spots on the sides of the second segment of the abdomen are each 

 connected internally with a smaller brown si^ot, the apical segment is 

 entirely black. 



In this species, the clypeus is very short and broad, and apparently 

 borders the eyes for a considerable distance above the base of the 

 mandibles; there is no suture marking oft' the side lobes of the clyi)eus, 

 but the fovese are as in Philanthus ; the median lobe is triangularly 

 produced subapically into a flat obtuse tooth with a depressed margin ; 

 the margin of the clypeus on each side of the tooth is broadlj' bisinuate, 

 the angle between the sinuses being situated beneath the fovere; 

 beneath the tooth of the median lobe is a tuft of a few bristles. The 

 labrum is slightly rounded anteriorly and has the anterior border sin- 

 uate. There is a triangular smooth spot above the intermediate coxre ; 

 the mesopleura have a prominent angle beneath, and behind this angle 

 a less prominent one. The tip of the sixth ventral segmeiit is deeply 

 bilobed at the apex, the sting aj^pearing between the lobes. 



23. EucEECERis CANALicuLATUS (Say) Cress., <? 5 . 



Syn. 9 Cerceris hidcntaia Say, West. Quart. Rep. ii, 80 (1823). 



^ PhllanUins mnaViculat us Say, West. Quart. Rep. ii, 7t) (182.'^), aiul Am. 



Ent., p. Ill, pi. 49, tig. 1 (1828). 

 $ Eueerceris canalicidatus Cress., Proc. Ent. Soc. Pliila. v, 112 (18(55). 



In this species the body is densely punctured, the punctures tending 

 to form strise upon face, sides of prothorax, and sides of metathorax; 

 on the disk of the prothorax and the inesothorax and on the abdomen 

 the punctures are usually less dense, a^id on the highly polished scutel- 

 lum and postscutellum they are sparse; the enclosure at base of meta- 

 thorax is highly polished, and, except at apex, transversely striate, the 

 apex smooth; on the venter the punctures are slight, and tend to pro- 

 duce rugse, and segments three to five ( 9 ) or six ( ^ ) have a slight me- 

 dian longitudinal groove; dorsal segments two to five have a transverse, 



