28 CALIFORNIA ACADEMY OF SCIENCES. 



peus, which, in that species, is narrower and considerably 

 extended be3'ond the insertion of the mandibles. 



Many specimens. Taken at San Jose del Cabo and at 

 San Fernando. 



3. Camponotus fumidus Rog. 



Camp, ftimidus 'Rog., Berl. Ent. Zeitsch., vii, p. 151. 



One ^ . San Julio. 



4. Camponotus marginatus Ltr., var. 



Formica marginata Ltr., Hist. Foiirm., p. 103. 



Camponotus marginatus Eog., Berl. Eut. Zts., 1862, p. •29'2. 



Formica fallaxlsjX., Form. Fr., ]). 57. 



Camponotus fallax Mayr, Europ. Form., p. 56. 



For7nica discolor Bnckley, Pr. Eut. Soc. Phil., 1866, p. 166. 



Formica San Sabeana, Buckley, ibicL, jd. 167. 



One ^ . San Julio. 



This variety is black and polished, with the scape of 

 the antennae and the legs dark brownish. 



Similar forms are found at Washington, D. C, and in 

 Florida. This form differs from them, however, in hav- 

 ing a distinct constriction or suture between the meso- 

 and metanotum and in the shape of the scale. It may 

 possibly represent a new species, though I am not pre- 

 pared to describe it as new from a single specimen. 



5. Camponotus erythropus n. sp. 



^ major, 5-7 mm; ^ minor, 4-5 mm. Opaque black, 

 the abdomen slightl}- polished. Mandibles and anterior 

 margin of head dark cherry-brown. Antenna, tibia; and 

 tarsi reddish, the tarsi somewhat darker; rest of legs 

 black. In the smaller specimens the middle and posterior 

 tibia are sometimes blackish beyond the middle. Eyes 

 brown. Pubescence white, glistening, rather long and 

 quite profuse. Hairs on the head above insertion of an- 

 tenna; as well as those on the thorax and base of first 

 abdominal segment finer and more slender than those on 

 the abdomen. Hairs in front of the insertion of the an- 



