Notes on Coleoptera of the Southwest. 93 



All these species seemed rather bewildered by the strong 

 light, and quiie sluggish, though characterized by wonderful 

 activity and alertness by da}'. I easily took them by hand, by 

 placing myself between them and the light so as to cast a 

 shadow over them. 



I'he case of C. spcrata seems to me quite strange, as it is a 

 species which runs in the sunlight on hot da3's and in its 

 natural habitat is in damp places such as exist along the river. 

 In cloudy or cold weather they retire to their holes and remain 

 there until the sun comes out again. How then does it 

 happen that they are attracted from such a long distance by 

 these lights ? C. i6-fiuictata which is common along the 

 river with C. s.pcrata in the day-time did not appear at the 

 lights. Possibly C. spcrata is more sensitive to light than C. 

 i6-pH)ictata, and is certainly of stronger flight. 



The Carabidx were represented by few species but came in 

 considerable numbers. The most numerous was JVothoptis 

 zabroides though AgonodcrusHiieoIa^ A. pallipcs, and Chloeniiis 

 soUtarius were not rare. Discoderus came occasionally as did 

 also Benibidittm, but both were scarce. 



Dytiscidce appeared as follows: LaccopJiilns mexicamis^ 

 Ccelambus medialis, niibtlis, Thcnnonectcs basilaris and Cybis- 

 ter jiinbriolatns. Hydrophilas triangularis was extremely 

 common every night. 



The onh' Staphvlinide found commonly was a large species 

 of BIcdius which dwells along the river banks. They came 

 to light in great numbers, climbing up the walls of adjacent 

 buildings. Dermestes marmoratus came often, and Anelastes 

 drurii, the only JE later id seen was not rare. 



Among the Scarabceidce the following species appeared: 

 Ochodceus biarmatus, LachnjsterHa fnsca^ L. criiiita and Thyce 

 squamicollis rare. Lachnosternaii longitarsus, Polyphylla haiii- 

 nwndi, Cyclocephala immaculata, a species of Ligyrits, and 

 Aphomis cJiinalis were more common. As has been men- 

 tioned elsewhere by Dr. Horn, the males of Polyphylla 

 hanimondi are more abundant than the females. 



