102 MR. smith's DESCRIPTIOJfS OF IIYMENOPTEROUS INSECTS 



one marginal and one subraarginal cell ; the discoidal cells obsolete. 

 Abdomen ovate, the node of the peduncle incrassate and subquadrate 

 in the females, in the workers forming a longish petiole clavate at the 

 apex; females and workers furnished with a sting. (Details, PI. I. 

 figs. 11, 12, 13.) 

 The characters here given will show the propriety of separating this in- 

 sect from the genus Formica, in which it has been hitherto included ; in my 

 general catalogue on the Formicidce I suggested the probability of this being 

 found necessary. There are apparently two species belonging to the 

 genus, — one F. smaragdina of Fabricius, the second F. virescens of that 

 author ; the differences between them are slight, but permanent ; the first 

 species inhabits India, most of the islands in the Archipelago, and thence 

 southward into the Moluccas; the second apparently distinct species is 

 found in Australia and South Africa ; these are the green Ants which 

 build in trees. Their nest is formed by drawing together a number of 

 green leaves, which they unite with a fine web. Some nests are a foot 

 in diameter ; they swarm, says Mr. Wallace, in billy forests in New Guinea ; 

 their sting is not very severe. This genus forms a link between the genera 

 Formica and Myrmica ; it agrees with the former in hslving a single node 

 to the peduncle, and with the latter in having the ocelli obsolete in the 

 workers, and in being fm-nished with a sting. 



1. CEcophylla smaragdina. Smith (gen.). 

 Formica smaragdina, Fabr. Syst. Prez. p. 39/. 



Hub. Dory ; Borneo ; Aru ; Celebes ; Sumatra ; Philippine Islands ; 

 India; Java. 



Subfam. PONEEID^, Smith. 



Gen. Odontomachus, Lafr. 



1. Odontomachus s^evissimus. Smith. O. ferrugineus, lajvis, 

 nitidus; capite antice longitudinaliter striato; thorace oblongo, 

 transversim striato. 



Female. Length 8 lines. Ferruginous : the head foveolate anteriorly 

 and delicately striated longitudinally; the mandibles with two long 

 stout, acute teeth at their apex, and with their inner margin serrated. 

 Thorax elongate ; the pro- and metathorax delicately striated trans- 

 versely ; legs elongate and slender. Abdomen ovate, very smooth and 

 shining ; of a rather deeper colour than the head and thorax. The 

 worker differs in having the thorax transversely striated throughout 

 its entire length, and narrowest in the middle; in the female it is 

 widest. (Plate I. fig. 9.) 



Hab. Bachian; Ceram. 



This species was first captured by Madame Ida PfeifFer at Ceram; the 

 female is here first described. 



2. Odontomachus animosus. O. ferrugineus ; margine interno 

 mandibulorum serrato ; thorace transversim striato. 



