GEOLOGICAL SURVEY OF THE TEEEITOEIES. 401 



Chelinideaj Uhler. 



G. vittigera, Uhler, (Proc. Eutom. Soc. Phila., II, p. 366.)— Brongbt 

 by the survey from Eoss Fork, Idaho ; Ogden, Utah ; and by Dr. E. 

 Palmer from New Mexico. In Texas it infests a species of Opuntia, 

 sometimes in considerable numbers. A few specimens have been taken 

 near the Kanawha Eiver, in Virginia. It varies in the color of the 

 antennse, from red to black, and in the width of the joints, which are 

 sometimes very broadly compressed. 



Margus, Dallas. 



M. inconspieuus, H. Schf., (Wanz. Ins., VI, Fig. 570.) — Collected in Col- 

 orado. It has been also found in Texas, Mexico, and California. 



CatorJdntha, St&l. 



0. mendica, St§.l., (Kongl. Svenska Akad., IX, p. 187, No. 2.) — Brought 

 from Colorado, and by Dr. E. Palmer from Fort Cobb, Indian Territory. 

 It is much larger than C. guttula, Fab., to which it is very closely allied. 



Ficana, St&l. 



♦ 



F. apicalis, Dallas, (British Museum List, II, p. 499.) — Specimens from 

 Arizona and California have been examined by me 5 but no specimens 

 hajppened to be brought home by the survey. 



Anasa, Amyot et Serv 



A. tristis, De Geer, (Memoires, III, p. 340, PL 34, Fig. 20;) Coreus 

 ordinatus, Say, ,(Jour. Acad. Phila., IV, 318, No. 2.) — This is the com- 

 mon squash-bug\ so destructive of pumpkins and melons in various parts 

 of the United States. It inhabits, also, Mexico, the West Indies, Cen- 

 tral America, and Brazil. The present specimens were obtained by Dro 

 E. Palmer, at Fort Cobb, Indian Territory. The southern and western, 

 individuals occasionally exhibit a wonderful degree of variability in the 

 shape of the prouotum. Specimens occur which have the lateral mar- 

 gins of that part either distinctly sinuated, with the humeri quite prom- 

 inent, or the reverse, with the sides bowed and the humeri broadly 

 rounded. 



Alydus, Fab. 



1. A. eurinus, Say, (Jour. Acad. Phila., IV, p. 324, No. 5;) A. ater^, 

 Dallas, (British Museum List, II, p. 478, 30.) — A common species in 

 the eastern regions of the United States, as also in Nebraska and in 

 Canada. It bears a very close relationship to A. calcaratus, Fab., of 

 Europe; but in all the specimens of the European insect which I have- 

 yet seen the collum of the prothorax is very short, and the disk of the 

 l)ronotum more robust and flattened than in our species. A careful 

 comparison with the description of Mr. Dallas proves his A. ater to be 

 only the female of our A. eurinus , 



2. A. Pluto. New species. — Intensely black^ much more robust than A. 

 eurinus^ Say. Head more robust, minutely scabrous, pubescent; the 

 constricted portion of the collum shorter; eyes and ocelli prominent; the 

 intraorbital surface longitudinally impressed, almost to the line of the an- 

 tennae. Sides and under side of the head minutely granulated, punc- 



26 GS 



