l62 CALIFORNIA ACADEMY OF SCIENCES. 



teriorly, and comparatively longer than in say/ ; the eyes 

 are also smaller and less strongly projecting; the protho- 

 rax more flattened above, its sutures deepey, and the scale 

 narrower and stouter. It differs from sayi also consider- 

 ably in the coloration of the head, thorax and scale, par- 

 ticularly in the smaller specimens. 



Head black; the cl3^peus, cheeks and space in front of 

 eyes red; the meso- and metanotum above, the upper an- 

 gle of the metathoracic declivity and the scale black or 

 dark brown. Otherwise as in Camp. sayi. 



? . Length, ii mm.; expanse of wings, 24 mm. 



The head is either red, with only the posterior edge of 

 the vertex more or less distinctly dusk}^, or of the same 

 coloration as in the worker minor. Thorax highly pol- 

 ished, red; posterior edge of pronotum above, a large 

 median spot anteriorly and a subdorsal vitta each side of 

 mesonotum, scutellum, mesosternal plate and abdomen 

 black. Legs and scale red. Posterior margin of ab- 

 dominal segments yellowish. Wings pale brownish, veins 

 and stig'ma darker. 



6 . Length, 6-7 mm. Entirely black, polished. Pos- 

 terior margin of abdominal segments, extreme tip and 

 genital valves yellowish-white ; the inner pair of valves 

 gradually brownish towards the end, the apex of the up- 

 per pair blackish. 



Described from many workers, two females and three 

 males. 



Chuparosa, Sierra Laguna. 



2. Myrmecocystus melliger (Llave?) Forel, var. 



SEMIRUFUS Em. 



M. mell/gcr var. semirtifus Emery, Zool. Jahrbttcher, vii, Abtheil. 

 f. Syst., p. 667. 

 One ^ . San Julio. 

 Absolutely identical with the dark form from Colorado. 



