98 Bulletin Wisconsin Natural History Society. [Vol. 7, Nos. 3-4. 



22. Clerus analis Lee. Tex. 

 23. Clerus thoracicus Oliv. Pa. ; Tex. 



One specimen from Texas has the entire pronotum pale yel- 

 low, the head and femora pale testaceous. This may be a slightly 

 immature specimen. 



24. Clerus moestus Klug. N. Mex. ; Nev. 

 25. Clerus sphegeus Fabr. Oreg. ; N. Mex. 

 26. Clerus abruptus Lee. Ariz.; Tex. 



The Arizona specimen is of the typical form, having the head, 

 thorax and legs red ; the Texas specimens are of the variety in 

 which the head and thorax are black. 



27. Clerus ichneumoneus Fabr. Pa.; Ohio. 

 28. Clerus muttkowskii sp. nov. 

 Similar to ichneumoneus in both form and color but differing as 

 follows : Head and thorax more finely and rather more densely punc- 

 tate, the latter proportionately shorter, the anterior margin sinuate, 

 sub-apical constriction stronger, the sides behind the middle strongly 

 convergent, nearly straight, (strongly arcuate in ichneumoneus) ; ely- 

 tra more deeply punctured, black, a broad median fascia yellow, 

 broader at flanks than at suture, margins lunate, the anterior with its 

 convexity toward base, posterior with convexity toward apex, suture 

 before the fascia narrowly and very obscurely testaceous nearly to the 

 scutellum, the latter black, apical fourth clothed with dense whitish 

 pubescence, the anterior margin deeply sinuate at suture. Length 

 8 — 10 mm. 



Two specimens. Labeled "Wis.,'' without other data. Type 

 in collection of the museum ; cotype in collection of the author. 

 The type has the sixth ventral segment of abdomen black, in the 

 cotype the entire abdomen is red. 



In all specimens of ichencumoncus the writer has seen the 

 median fascia is rather irregular in outline and slightly prolonged 

 posteriorly at the suture, while in the present species the fascia 

 curves toward base as it approaches the suture. The principal 

 character, however, relied upon for the differentiation of this spe 

 cies is the great difference in form of the prothorax. 



Named for my friend, Mr. Richard A. Muttkowski, as a token 

 of appreciation of many favors received. 



