354 JOHN HAMILTON, M. D. 



Euplectus crinitus Lee. — Scarce ; found under bark of dead trees, April, May. 



Euplectus interruptus Lee.-- Not very abundant in rotten logs and .stumps, in 

 Spring. 



Euplectus confluens Lee. — Abundant in Autumn and Spring in rotten wood ; 

 varies in the sculpture of the head and the shape of the ventral sexual marks 

 of the male. 



Euplectus elong-atus Brend. — Rather scarce ; found with confluem. 



Euplectus pertenuis Casey. — A dozen sj)ecimens taken with Trimium parvulum ; 

 others found with Euplectun confluens in Spring. 



Euplectus leviceps Casey. — Three examples from Cambria County. Pa., April. 



Euplectus sp. — Near confluem, but smaller, with more slender and graceful an- 

 tennje and different ventral, sexual marks in the male ; several % i^nd 9 

 specimens found in dead wood in Winter; apair Dec. 26, 1894. 



Trimioplectus obsoletus Brend. — Scarce ; only three specimens, two of which 

 were obtained Dec. 26, 1894. 



Trimioplectus ruflceps Lee. — Four examples from rotten, red oak log, April, 

 189.-). 



Trimioplectus arcuatus Lee. — One si)ecimen .so named by Dr. Brendel. 



Actium sj). — A single si)eciinen, referred to this genus by Dr. Brendel, wliich was 

 collected in Cambria County. 



Eutyphlus similis Lee. — Very abundantly obtained from under old leaves on 

 the Chestnut Ridge in Winter ; three to four hundred specimens. 



[Thesium cavifrons Lee. — Occurs under stones, etc . April.] 



Arianops amblyoponica Brend. — Although twenty specimens have been col- 

 lected in four years this is a very scarce insect, found on the Chestnut Ridge. 

 The first pair ever seen by me walked about among ants, and one of them 

 escaped me in one of their galleries. Since then it has usually been found 

 under stones rather deei)ly imbedded in the ground, and apparently not in 

 comjjany of ants, though always in their immediate neighborhood. The de- 

 scril)ed type is a 9 . Found from .July 20th to October. 



Batrisus schaumii Aube. — From fifteen to twenty S])ecimens have been found 

 in rotten stumps during Spring. 



Batrisus riparius Say. — Found with the last and in about equal number. 



Batrisus scabriceps Lee. — Taken but once, three 9 ^"d nine "J, specimens, 

 Dec. 26, 1894, in the same material from which Eamicnis sp. and Trimeopledus 

 ohaoh'tus were obtained. 



Batrisus bistriatus Lee. — Abundant, but exclusively taken here in the nests 

 of Formi.cn .suhsp.ricea Say or in the mixed colonies of this ant and F. subintegm 

 Em. Does not occur on the Chestnut Ridge. 



Batrisus frontalis Lee. — A single pair lound under a log on the Chestnut Ridge, 

 May. 



Batrisus globosus Lee. — Not rare. Here it occurs in very rotten and friable 

 oak logs or stumps and under bark in April, and not with ants; but on the 

 Chestnut Ridge— during May and the Summer — I have looked for it and 

 found it only in the hills of Formica exsectoides Forel. ; i» Cambria County it 

 has been taken with Formica subnericea Say on several occasions. 



Batrisus punclifrons ("asey. — Has not occurred here, but quite often on the 

 Chestnut Ridge; and in Cambria C^iunty, as well as in Elk County, under 

 layers of old leaves and sometimes under bark or in logs. It is sometimes, 

 accidentally perhaps, met with in the galleries of Camponotus pennsyleaniciis 

 DeGeer with I'lomophiKiiis hrachi/derus Lee. 



