Mar. 1S99.] Fall: On American Species of Acm/Eodera. 27 



of the present group, and the prosternal characters are not so different 

 as to prevent the confusion. Decipietis is however separable from 

 these with certainty by the thora.K being much less narrowed in front, 

 and by the thinner, more broadly rounded or subtruncate ventral plate. 

 The markings are also more irregular than in the species mentioned. 

 Length, 7.5-10.5 mm.-, .30-. 42 inch. 



Habitat : New Mexico and Arizona. 



The only specimens before me with definite locality label are from 

 Fort Huachuca, southeastern Arizona, collection of Mr. Daggett. 

 A. scalaris Mann., Bull. Mosc, 1837, VIII, p. 25. 



A moderately large robust species, black, scarcely bronzed elytra 

 each with a lateral and discal yellow stripe in basal half, and some 

 more or less confused markings posteriorly. The figure and descrip- 

 tion of Horn are sufficient for the recognition of this species which does 

 not seem to vary much. Length, 9.5-11 mm., .38-. 44 inch. 



Habitat: Texas, Arizona, New Mexico (Las Cruces, on Verbesina 

 encelioides, Cockerell). Mannerheim's name is believed to apply to 

 the insect afterward described by Gory as iniina and must therefore 

 supplant it on our list. 



AcMiEODERvE Truncate. 



It is not possible to more sharply define the limits of the present 

 group than is done in the preliminary table, in which it is said to con- 

 tain those species in which the front margin of the prosternum is not 

 or but little retracted, and usually nearly straight. The proper inter- 

 pretation of the prosternal characters requires so much familiarity with 

 the range both of specific and individual variation, that members of 

 the group at hand wall be perhaps more surely recognized by their 

 small size and narrow convex form than by any other characters. No 

 species of this group is notably depressed, none are in the least costate, 

 all except the first four and cribricollis are below medium size (.30 

 inch or less), the hairy vestiture is generally shorter and coarser than 

 in preceding sections, and the thoracic impressions are reduced to little 

 more than basal foveae. Mariposa has been transferred to the Emargi- 

 natjfi for reasons already given ; on the other hand stigmata and 

 bivulnera are placed here rather than in the Sinuatae as indicated by 

 Dr. Horn, since with the exception of the prosternum their general 

 structure and facies is entirely in accord with typical Truncatae. Nor 

 is precedent lacking for such a course, inasmuch as guttifera and 



