FORMICID.^ FROM LOWER CALIFORNIA. 35 



Thorax much elongated, almost twice as long as the 

 head, the divisions but feebly indicated. Prothorax and 

 dorsum of mesothorax polished and delicately shagreened; 

 the metathorax and sides of the mesothorax with dense, 

 transverse stria? ; the posterior declivity and thorns of the 

 metathorax smooth and polished, the thorns with longi- 

 tudinal strias at base. Thorns large, gently curved, in- 

 clining backward. Nodes of the petiole polished, faintly 

 shagreened, each with two longitudinal, impressed lines 

 above ; the highest point of the first node slightly inclin- 

 ing forward; second node pyriform, stoutest posteriorly. 

 Abdomen highly polished, with scattered piliferous punc- 

 tures, those of the first segment prolonged posteriorly in 

 a depressed line of the length of the hairs. Legs long, 

 slender and highly polished, the hairs denser and shorter 

 than on the rest of the body. 



Four ^ 2 . Hermosillo, Sonora. 



This may possibly be but a variety of Aph. albisctosa 

 Mayr, from the description of which it appears to differ 

 in the shape and sculpture of the thorax. 



15. SoLENOPSiS GEMINATA Fab. 

 Atta geminates Fab., Syst. Piez., p. 423. 

 Myrmica jialeata Luud, Auu. Sc. Nat., 1831, p. 116. 

 Solenopsis 7nandlbularis Westw., Aun. Mag. N. H., vi, 1S41, p. 87. 

 Afyrmica Gay i S])in., Hist. Chile, vi, 1851. 

 Myrmica virulent Sm., Cat. Brit. Miis., 1858, \>. 132. 

 Atta clypeaia Sm., Cat. Brit. Mus., 1858, p. 169. 



Myrmica savissima Sm., Tr. Eut. Soc. Loud., u. s., iii, 1855, p. 166. 

 Solenopsis cephalotes Sm., J. Proc. Linn. Soc, iii, 1859, p. 149. 

 Cremastofjaster laboriosus Sm., J. Proc. Linn. Soc., v, sniDiiL, 1861, 



p. 109. 

 Dijilorhojitriim Drewseni Mayr, Enrop. Form., 1861, p. 73. 

 Myrmica glaber Siud. })olita Sm., Trans. Eut. Soc, 3d Ser., 1862, p. 34. 

 Atta coloradensis Buckley, Proc. Eut. Soc. Phila., vi, 1866, p. 346. 

 Solenopsis xyloni McCook, Rep. on Cotton Ins., 1879., p. 188. 

 Four ^ 2 major, three 2 5 minor. Comondu and 

 Patrocinio. 



