338 S. B. Buckley on North American Formicidse. 



small, circular, lateral and placed about midway of the head ; antennae 

 long and enlarged anteriorly; mandibles large ; triangular, curved in- 

 ward, and with two sharp teeth at the apex; head not grooved, and 

 but slightly depressed below near the middle, and concave beneath the 

 occiput; prothorax small, much narrower than the head, compressed and 

 irregular in outline; divisions of the thorax strongly marked or stran- 

 gulated; mesothorax rounded and raised to a point in the middle; the 

 metathorax has two short spines; scales of the pedicle sub-equal and 

 jagged ; abdomen smaller than the head, ovate. 



Worker minor. Length 0.13 inch. — Head aud abdomen piceous ; 

 thorax and legs yellowish-brown ; head small, sub-triangular, rounded 

 above and flattened below ; eyes large, lateral, and placed a little in 

 front of the middle part of the head ; prothorax narrower than the 

 head, rounded aud smooth above; legs long, slender ; otherwise like 

 the larger worker. 



Hah. — Central Texas. Common- It has dwellings in the ground, 

 twelve to eighteen inches beneath the surface, sometimes beneath 

 stones and sometimes in open spaces, throwing the excavated dirt, 

 without order, over the surface. The larger workers seem to do little, 

 being seldom seen in the open air, nor do they assist in conveying the 

 larvae to a place of safety when their abodes are uncovered. They 

 are much less active than the smaller workers. 



4:;. Myrmica (Monomarium) minima, n. sp. 



Female. Length 0.22 inch. — Color jet-black, the whole body 

 smooth and shining ; legs and margins of the segments of the abdo- 

 men brownish-black, or subhyaline; head triangular, rounded above; 

 occiput not emarginate, the posterior angles rounded and of about the 

 same width as the thorax ; mandibles small, curved, acute and tri- 

 angular; eyes small, circular, lateral, and placed about midway of the 

 head; antennae long, filiform, and enlarged anteriorly; thorax with its 

 sides compressed, the divisions but slightly marked ; mesothorax the 

 highest; scales large, the front one slightly compressed, incliued for- 

 wards, and subacute, the other rounded; abdomen large, ovate, oblong, 

 upper surface of the body aud head sprinkled with a few gray hairs ; 

 slender in outline. 



Worker. Length 0.06 inch. — Black; head wider than the thorax; 

 pedicle long ; abdomen but little larger than the head, ovate and 

 acute; otherwise like the female. 



Lives under stones and beneath the bark of decaying trees. It also 

 oxcavates into the ground, but two or three inches below the surface. 



