MEXICAN FORMICIDyE. 87 1 



13. DoRYMYRMEX PYRAMicus Rog. var. NIGRA n. var. 

 Worker: Length, 2.8-3.4 ™ni- Black; the mandibles 



reddish -yellow, the under side of the head and the tarsi 

 brownish. This form is somewhat more robust, though 

 otherwise like jiavus. 



Twenty-five specimens. Tepic. 



Subfamily Ponerini, 



14. EcTATOMMA RuiDUM Roger. 



Ponera ( Ectatomma ) ruida Eoger, Berl. entom. Zeitsch., iv, 1860, 



p. 306. 

 Ectatomma ruidum Maj'r, Verb. zool. bot. Ges., Wien, xii, 1862, p. 



732. 

 Ectatomma scahrosa Smitb, Trans. Ent. Soc, London (3) i, 1, 1862, 



p. 31. 

 Ectatomma scahrosa Roger, Berl. entom. Zeitscb., vi, 1862, p. 292. 

 Ectatoinma ruidum Mayr, Verb. zool. bot. Ges., Wien, xxxvii, 1887, 



p. 539. 



Eleven specimens. Tepic. 



This species is quite common in Brazil, Central Amer- 

 ica and the West Indies. 



15. Ectatomma (Gnamptogenys) rimulosum Roger 

 var. splendidum n. var. 



Worker: Length, 4-4.6 mm. Head longer than broad, 

 its sides parallel, the posterior angles rounded, the occiput 

 slightly emarginate. Eyes convex and projecting, placed 

 beyond the middle. Antenna rather short, the scape 

 barely reaching the occiput, the flagellum clavate, joints 

 two to eight shortest and about as long as broad. Cly- 

 peus triangular and about as broad as long, the anterior 

 margin straight, the upper surface faintly concave. Man- 

 dibles elongated, narrow, leaving a large triangular open- 

 ing between them when closed, the terminal half curved 

 downward; the cutting edge smooth or faintly denticu- 

 late. 



