42 JouRXAL Xew York Entomological Society. [^'°1- xxii. 



except its ventral surface, which is opaque and finely punctate. Gaster and 

 legs smooth and shining, with small scattered, piligerous punctures. 



Hairs pale yellowish, erect, unequal in length, moderately long and abun- 

 dant, covering the whole body and appendages. 



Head and gaster black, front of head and remainder of body dark red ; 

 mandibles, middle portions of antennal scapes and of the femora and tibiae 

 darker and almost black, posterior borders of gastric segments reddish. 



Described from several specimens taken from a temporary nest 

 under a stone at Guerrero Mill. This species is readily distinguished 

 from melanocephahim by its much shorter antennal scapes, the coarse 

 puctuation of the dorsal surface of the head in the large worker, the 

 longer petiole and smooth sides of the pronotum in all the workers. 



Subfamily MYRMICIN^. 



8. Pseudomyrma flavidula F. Smith. 



^^'orkers, males and winged females taken from a colony nesting 

 in a grass-culm at San INIiguel. These belong to the larger, typical 

 form of the species. 



9. Monomorium minimum Buckley. 



Several workers and dealated females from Guerrero ]\Iill agree 

 very closely with Texan specimens of this form, which should be re- 

 garded as a distinct species and not as a variety of minutiim Mayr. 

 I find that the teeth on the clypeus and the ridges into which they 

 are continued, are much more prominent in both the females and 

 workers of minimum than they are in topotypes of minutiim from 

 Venice, Italy. Moreover the famale of minimuin is winged and 

 has the head subopaque, finely longitudinally striated in front and 

 coarsely punctate above, whereas the corresponding phase of min- 

 utum is apterous and its head is shorter, more shining, more feebly 

 striated and its punctures much smaller. The thorax of the female 

 viiiiutum is distinctly smaller and more slender and the petiolar 

 and postpetiolar nodes much narrower and of a different shape, the 

 petiole being epedunculatc, whereas it is distinctly pedunculate in 

 minifiiuiii. The peduncle of the petiole is very short also in the worker 

 of minimum. Besides the two following subspecies what I have 

 called the subsp. crgatogyna from Santa Catalina Island, Cal., should 

 also be attached to minimum and not to minutum. Both of these 

 species differ from carbonarium F. Smith and its subsp. ebcninum 



