NORTH AMERICAN HTMENOPTERA. 217 



MOTOZUS Forster. 

 Verhand. der Naturhist. Vereins der preuss. Rheinlande x, 331, 1853. 

 Head and thorax all over about evenly punctured in most of the spe- 

 cies, the occiput, pro- and mesothorax, more or less sparsely punctured ; 

 in some densely, in others, like Elartipus, with smoothed areas. Abdomen 

 closely and finely punctured ; in some simply roughened by the punc- 

 tures being shallow and confluent ; margins of third segment bisinuate. 

 The postseutellum in most of the species projecting into a well defined 

 cone shaped piece or blade, which is flat above and rounded apically, but 

 in other species this is only indicated by the postseutellum being obtusely 

 mucronate, hardly projecting as seen laterally. The genus was originally 

 founded on the prolongation of the postseutellum, and though this char- 

 acter is inconstant, it is generally correllated with the true diagnostic 

 character, viz. : apex of third segment icith the snout-like projection 

 filled up hi/ a memhrane that is triangidnrly excised beneath. 



Postsoutellum somewhat obtusely pointed but not projecting posteriori}' into a 



horizontal blade interinedius. 



Postseutellum prolonged posteriorly into a raised, partly separate, horizontal blade 

 or cone. 

 Pro- and mesothorax mostly smooth, the former punctured only on the anterior, 

 lateral and posterior margins, and sparsely in the middle, and the 

 latter with sparse punctures on the sutures; lateral margins of 

 third segment with the apical half semi-transparent, brown. 



semiiiudus. 

 Pro- and mesothorax nearly evenly covered with punctures: lateral margins of 

 third segment concolorous with the rest of the abdomen. 

 Abdomen bright golden and cupreous, with brassy and green reflections, thorax 



green and blue ilitidus. 



Abdomen like head and thorax, from dark blue with purjije reflections to 

 emerald-green with brassy reflections. 



Wings clear hyaline, not infuscated hyaliiiiis. 



Wings infumated or infuscated. 



The snout-like projection at abdominal apex with its closing membrane 

 semi-transparent brown, and with a band of the same color before 



its apical margin versicolor. 



The snout-like projection with its closing membrane black, concolored 

 before its apical margin. 

 Abdomen, in shape, ordinary; about as long and wide as most of the 

 species of this genus and its allies; the snout-like projection also 

 median in size. 

 ■The snout-like projection of abdomen broad, short, not projecting 

 very distinctly beyond the line of the margins of third segment. 



viridicyaneus. 

 The snout-like projection is longer and narrower, prtyecting distinctly 



beyond the margins of third segment niargiiiatus. 



Abdomen longer and narrower, the snout-like projection larger in re- 

 lation to the third segment than in other species. ...productiis. 



TRANS. MEAE. ENT. SOC. XIl. (32) NOVEMBER, 1885. 



