OF WASHINGTON. 173 



above) with a very short process, hardly a spine. Stigmal plate (fig. 17, 

 at left, below) subcircular, quite strongly sculptured. 

 Length 6.5 mm. (swollen female) ; shield, I mm. 



From a raccoon in Live Oak County, Texas (Mitchell and 

 Bishopp). 



This species will run to I. hexagonus in my table of Ixodes 

 in the Revision of Ixodoidea, but it differs at once from that 

 species in the abruptly-ending tarsi, as well as in minor points, 

 as shape of porose areas, etc. 



A CATALOGUE OF AMERICAN AQUATIC AND SEMI- 

 AQUATIC HEMIPTERA. 



BY G. W. KIRKALDY, F.E.S., and J. R. DE LA TORRE BUENO. 



As no catalogue of aquatic Hemiptera has been published 

 for more than thirty years, the present list has been prepared 

 for the use of our colleagues and ourselves. It was our inten- 

 tion at first to restrict it to the species of America north of 

 Mexico, but the American regions and subregions are difficult 

 to limit sharply, and so many northern workers visit the An- 

 tilles, Mexico, and even farther south, that we feel that a more 

 comprehensive list will be at once scientific and convenient. 



A large amount of material is in our hands for working up, 

 and in due time we hope to replace this list by a critical synop- 

 sis of the American aquatic and semiaquatic Hemiptera. 



In this list the references have been abridged so that they 

 may be given complete for each genus and species. The genus 

 under which each species has been described is given in paren- 

 theses following the name of the species. The numbers of 

 the families, subfamilies, and genera are those in the senior 

 author's List of Genera,* such as are omitted being those that 

 do not occur in our fauna. This catalogue is intended to in- 

 clude everything published before July I, 1908. 



The following works at least should be in the possession of 

 every worker in aquatic forms in the Heteroptera : 



BERGROTH, DR. E., AND BUENO, J. R. DE LA TORRE. 



On the aquatic and semi-aquatic Hemiptera collected by Prof. 

 James S. Hine in Guatemala. (First paper.) < Ohio Nat., 

 viii, pp. 370-382, figs. 1-5. 



a See bibliography, p. 174. 



