

351603 W^sJT" 



VOL. I, PP. 1-12. September 15. 1903. 



INVERTEBRATA PACIFICA 



Contributions from and through Department of Biology, Pomona College. 



EDITED BV C. F. BAKER. CLAREMONT. CALIFORNIA. 



HOMOPTERA 



ON THE GNATHODUS SPECIES OF THE ABDOM- 

 INALIS GROUP. 



C. F. BAKER. 



Gnathodiis abdonniialis is one of the commonest species 

 of the group in the United States, being- especially well 

 distributed in the southern two-thirds of this area. It is 

 the type form of a g^roup of the old g-enus in which the 

 head is as wide or wider than the pronotum, and the ocelli 

 approach very closely to the eyes. These characters g-ive 

 it an aspect very diiferent from that of the orig-inal type of 

 Gnathodus. 



I propose to here separate aMominalis as the type of a 

 new genus—Eugnathodus. In western Nevada I found a 

 new FMgnathodus, differing- remarkably from abdominalis 

 in that the vertex was considerably produced. In western 

 Nicarag-ua I found the g-enus well represented, while ex- 

 tensive collecting- failed to turn up a sing-le true Gnathodus. 

 The g-enitalia are very similar in all the species, in the 

 female the hind marg-in of last ventral seg-ment being- 

 simply truncate, so far as observed. 



Genus Eugnathodus. 



Synopsis of Species. 





(a) Vertex strongly produced at middle; color pale 

 olive, the head fuscous and the elytra whitish trans- 

 lucent; length 3 mm Mountains bordering Lake 

 Tahoe in Nevada Nevadensis n. sp. 



