232 GEO. H. HORN, M. D. 



its markinfrs to ornatus. There is, however, no humeral dark ppot; 

 the unibonc is prominent and less punctured. The sexual ventral 

 characters are as in the other Trichodes. 



The two specimens before me, (the % was kindly loaned by Mr. 

 Ulke), were obtained by Mr. Otto Luggar, (of IJaltimore), from 

 Arizona. 



In the above wood cut the white portions are yellow, the lined 

 spaces ferruginous, and on the margins of the yellow are the black 

 borders. The niale in the cabinet of Mr. Ulke, is smaller and the 

 dark colors are lighter, so that, what is described as bluck in the 

 female is brown, and the brown is dirty ochreous. 



The sexual cliaraeters of Nortli Ainorican <'IC'I\nEL.ID.E 

 with notes on some groups of C'I(J1K1>EL>A. 



BY GEORGE H. HORN, M. D. 



The present paper is the first of a series which I hope to continue 

 from time to time, in which the sexual characters of each genus ia 

 our fauna will be fully exposed, and noticing at the same time any 

 special characters whether sexual or not, likely to prove useful to the 

 systematise 



I am not aware that any similar work has ever been attempted, 

 while its great utility must be acknowledged by all. In most of the 

 larger works on the genera of Coleoptera, mention is made of the 

 more prominent sexual characters, while others less obvious but often 

 more useful are entirely omitted, and it ia to these that I desire to 

 devote special study. 



It is often annoying in studying a generic synopsis to find groups 

 indicated in which the males do or do not possess a given character, 

 and this is frequently the only sexual character spoken of at all, its 

 absence being peculiar to all the females and a portion of the males, 

 and there is no additional character given which will absolutely dis- 

 tinguish all males from the females. 



It is my desire to bring together in one paper all the sexual cha- 

 racters heretofore known, and to add whatever new it may be my 

 good fortune to discover. Some characters may be overlooked, but 

 with the present as a basis, others may be added as each investigator 

 may find them. 



