108 GEO. H. HORN, M. D. 



The sexual differences are extremely sli<;ht. The male has the last 

 ventral segment truncate at tip, in the female it is oval. The thoracic 

 horn is also a little wider in the female. 



Occurs in the iVt^^'^tic States, and is at times very abundant. 



M. iitipertl.S n. sp. — Form moderately elongate; head piceovis, front flat or 

 slightly concave ; surface finely punctulate and pubescent: thorax transversely 

 oval, rather coarsely, not densely punctate, sparsely and finely pubescent, horn 

 moderately wide, distinctly margined at apex, scarcely serrate at the sides, crest 

 rather abruptly elevated, one-half the width of the horn, distinctly margined but 

 not serrate : elytra oblong, opaque, finely and densely punctured, pubescence fine 

 and entirely recumbent; humeri distinct, apices conjointly rounded in both sexes, 

 the sutural angle being slightly obtuse; color reddish testaceous, apical fourth 

 black, near the middle a transverse band, broadest externally, and which extends 

 broadly along the suture enclosing the usual scutellar spots : body beneath piceous, 

 finely punctulate, and with fine cinereous pubescence: legs piceous, tibiae and tarsi 

 jialer. Length .14 inch : ;;.o mm. 



The sexes are alike in the form of tha elytra at tip, and do not differ 

 appreciably in the form of the tharacic horn. The last ventral segment 

 of the male has an unusually large and deep excavation extending i'rom 

 the tip to the preceding segment. 



The color varies but little. The thorax may be piceous or rufous. 

 The elytral markings are very constant in their extent and form in the 

 dozen specimens before me. The type of marking is the same as that of 

 tdlpa. 



The only species resembling this is tulpn, and the two may be known 

 by the sexual characters, the female of talpa having truncate elytra, 

 while the male of uupenis has the deep fovea in the last ventral segment. 



Occurs in Arizona (Morrison), New Mexico and Kansas. 



X. talpil Laf.— Beneath piceous ; thorax, antennre and legs testaceous; elj'tra 

 testaceous, with post-scutellar spots, median sinuous band and apical space pice- 

 ous; head piceous, sparsely punctate, front rather deeply concave, very sparsely 

 pubescent; thorax oval, distinctly transverse, punctulate, sparsely pubescent, sub- 

 opaque, horn moderate in length, oval at tip, rather widely margined and serrate 

 feebly at the sides, crest abruptly elevated, strongly margined and slightly crenu- 

 late ; elytra rather elongate, humeri distinct, the apices separately rounded in the 

 male, or truncate in the female; disc distinctly obliquely ijnpressed behind the 

 humeri in the male, scarcely so in the female; punctuation fine but not dense, 

 pubescence fine, cinereous and recumbent, with a few short semi-erect hairs; body 

 beneath rather densely punctulate and sparsely pubescent. Length .14 -.16 inch; 

 3.5 — 4 mm. 



In the male the last ventral segment is truncate and slightly emargi- 

 nate, the apices of the elytra separately rounded, and the thoracic horn 

 very little wider than the crest. In the female the apices of the elytra 

 are sinuate truncate, the sutural angle being sharply rectangular. . 



