Vol. xxix| ENTOMOLOGICAL NEWS. 25 



fond of attending plant lice. In one field of rye a large num- 

 ber of this species had their nests in the soil at the base of 

 rye plants, on which occurred the green bug, To.roptera grami- 

 num, and were busily attending this species. 



Genus Tapinoma Forster. 

 T. sessile Say. 



This slender black species builds its nests under stones, 

 leaves and the bark of logs ; generally in sunny spots. The 

 workers have a characteristic odor. The pupae are salmon 

 colored. The workers of this form resemble those of 

 Dor\mynne.\- pyratnlcus in appearance and action. This species 

 may be distinguished from other ants by the presence of a ves- 

 tigial petiole. 



Subfamily CAMPONOTINAE. 



1. Workers polymorphic; no ocelli present Camponotus 



Workers not polymorphic, though often variable in size 2. 



2. Clypeal fossa distinctly separated from the antennal fossa 3. 



Clypeal fossa confluent with the antennal fossa 5. 



3. Mesonotum not constricted or cylindrical; ocelli present, 



Formica 

 Mesonotum constricted 4. 



4. Antennal scapes and tibiae without erect hairs: mesonotum sub- 



cylindrical; workers nest in moist places .. .Prenolepis s. str. 

 Antennal scapes and tibiae with erect hairs: mesonotum con- 

 stricted but not sub-cylindrical Subgenus Nylanderia 



5. Maxillary palpi six-jointed Lasius s. str. 



Maxillary palpi three-jointed Subgenus Acanthomyops 



Genus Camponotus Mayr. 



1. General color of body black 2. 



General color of body yellow and black, or red and black 3. 



2. Form robust; workers polymorphic; head and thorax sparM-ly 



covered with large yellow hairs; the abdomen with numerous 

 large and small hairs, the small hairs giving it a bronzed metal- 

 lic lustre . . . .here ulancits L., Subspecies pennsylvanicus DeGcer 

 Body slender; head, thorax and abdomen smooth, shining black; 

 body practically devoid of hairs except on the abdomen, where 

 the anterior and posterior edge of each segment bears a fringe 

 of long hairs falla.r Xyl., var. ncarcticus Emery. 



3. Form robust: workers polymorphic: color of body yellow ex- 



cept the head, which is piceous; abdomen with numerous long 

 hairs castanciis Latr., subspecies anicricanns Mayr. 



