JOUENAL OF ENTOMOLOGY AND ZOOLOGY 11 



tions of Dr. Van Dyke, Dr. Blaisdell, Dr. Fenyes, Mr. Nunen- 

 macher and Mr. Hopping, I have detected no less than ten new 

 species — including one from Arizona — thus more than doubling the 

 number hitherto defined, and proving that the Pedilus fauna of this 

 Coast is far richer than that of all the rest of the United States 

 combined. Moreover, further collecting may well bring to light 

 additional species in the Pacific region, while the number from east 

 of the Rockies is more likely to be decreased than increased by a 

 new critical study. 



The descriptions in the following pages will be found as a rule 

 very brief, embodying little more than those diagnostic characters 

 which have proved of service in comparative study. Throughout 

 the genus there is great uniformity in bodily form, general structure, 

 pubescence, etc., and it is only in the few exceptions to the general 

 rule that these matters have been alluded to at all. As is well 

 known, the sexual characters of the male, both primary and second- 

 ary, are very varied and interesting, and it is only by means of them 

 that the species can be readily and satisfactorily identified. In the 

 $ 's perhaps without exception, the antennae are more or less notice- 

 ably longer and more strongly serrate; the apical margins of the 

 fifth and sixth ventral segments are also more or less sinuate or 

 emarginate in this sex throughout the genus. The special modifica- 

 tions of the elytral apex in the 5 's of a majority of species, and 

 also the genitalia in this sex, are sufficiently varied to require careful 

 description in each species. The intromittent organ of the $ 

 consists of a corneous sheath terminating in two lateral processes 

 of variable form, which are frequently hooked or barbed on their 

 inner margins, and containing the true efferent duct, which is itself 

 corneous, or at least of denser consistency toward the tip, which is 

 more or less acuminate. I have in the accompanying plate illus- 

 trated by simple outline sketches the variations in the form of the 

 oedeagus, as well as the chief modifications of the antennae and claws 

 of the species here treated. 



It is not my purpose at this time to speak individually of the 

 species of Pedilus inhabiting the Eastern United States. As at 

 present understood, they are easily enough identifiable by means of 

 Horn's latest table ; but there is unquestionably room for renewed 



