March, 1914.] WllEELER: AntS FROM HiDALGO, INIeXICO. 55 



Guerrero INIill. This species is most closely related to L. schmitti 

 Wheeler of Colorado, but the worker is readily distinguished by its 

 much darker color, shorter head, shorted epinotal spines and very 

 different petiolar node. The new species also bears a superficial re- 

 semblance to L. stolli Forel, known only from the summit of the 

 Volcan de Agua, in Guatemala (13,000 ft.), but the worker of this 

 species is larger (nearly 3 mm. long), has a longer head and the 

 thorax is more rounded and not prismatic. 



Subfamily DOLICHODERIN.E. 



23. Tapinoma sessile Say. 



Numerous workers and dealated females from San Miguel and 

 Guerrero jNIill agree very closely with our large, common North 

 American form of this species. 



24. Liometopum apiculatum Mayr. 



Many workers and two males from Guerrero Mill and Pachuca. 



Subfamily CAMPONOTIN.E. 



25. Prenolepis (Nylanderia) vividula Nylander. 



Several workers from San Miguel. 



26. Prenolepis (Nylanderia) mexicana Forel. 



IMany workers, three females and a single male from nests in the 

 soil beneath stones at Guerrero Mill. The hitherto undescribed fe- 

 male measures 4.5-5 mm. and is very dark brown, with the funiculi, 

 tarsi and articulations of the legs yellowish and the wings rather 

 deeply infuscated, with brown veins and stigma. The pilosity is 

 similar to that of the worker, but the pubescence is gray, rather long 

 and very dense, covering the whole body so that it is opaque and not 

 shining as in the worker. 



27. Lasius (Acanthomyops) interjectus Mayr subsp. mexicanus new sub- 



species. 



Worker. — Differing from the worker of the typical form from the United 

 States in its smaller size (only 2.7-3.3 mm., whereas the typical interjectus 

 measures 3.5-4 mm.), and in having the long hairs on the body somewhat 

 finer and less flexuous. 



Female. — Not darker than the worker and much smaller than the typical 

 form (length 4.5-5 mm. as compared with 6.5-7 mm. in the true interjectus), 



