460 HYMENOPTEBA. 



towards the apex); the third segment has a short, shining, impunctate furrow immediately 

 before the apex in the centre ; the ventral surface is shining and punctured, but not 

 strongly so. The hind coxae and femora are punctured; the four hind tibiae are 

 furrowed and bear some large scattered punctures ; the apical joints of the tarsi are 

 brownish. 



Length 8 millim. 



Hah. Guatemala, San Geronimo (Champion). 



A smaller insect than H. guatemalense, and easily known from it by the apex of the 

 abdomen not being notched, and by its having a short, broad, and deep furrow in the 

 centre. In both species the postscutellum is as in H. dimidiatum (Say) and H. viride 

 (Cresson) ; in all four there is a triangular punctured area below the postscutellum. 



Subfam. CHRYSIDINJE. 



Of this subfamily only two American genera are known — Chrysis and Stilbum. The 

 latter is American on the authority of Aaron, who (Trans. Am. Ent. Soc. xii. p. 243) 

 records 8. amethystinum (Fabr.) from Ontario, a species known from the Palaearctic, 

 Oriental, and Australian regions. 



CHRYSIS. 



Chrysis, Linnaeus, Syst. Nat. ed. xii. i. p. 947 (1767). 



The most extensive genus of Chrysididae. Forty North- American species are known, 

 and many inhabit the Neotropical region. It has a wide range over the Old World. 



i. Apical margin of the third abdominal segment entire. 

 1. Chrysis mexicana. (Tab. XX. figg. 10, 10 a.) 



Dull emerald-green, with bluish tints on the legs and thorax ; broad, obovate, covered 

 densely with a moderately long fuscous pubescence. Head, pro- and mesonotum closely 

 and uniformly punctured ; metanotum with the punctures larger, more irregular, and 

 more widely separated ; pleurae with the punctures still larger, and running into reti- 

 culations; basin of face not very deeply excavated, transversely striated. Lateral 

 margin of metathorax acutely triangularly pointed, punctured. Abdomen with the 

 first and second segments uniformly covered with shallow, clearly separated punctures ; 

 the third segment more strongly punctured ; the base of the first segment almost trans- 

 verse. Apical margin of the third segment rounded (but not forming an arc of a circle, 

 not being broad enough), entire, the base not angled ; the apex without pits, but with 

 a distinct margin, in front of which there is a narrow groove. Antennae black, the 



