A PPENDIX— H YMENOPTERA . 9 5 



Worker. Testaceous, ol>scured with fuscous or black. Head and 

 mamliljles smootli, shining, impunctate, front sometimes faintly aciculated ; 

 frontal laminae somewhat shorter than in soldier ; sides of pleura' longitudi- 

 nally striated and p)unctured. Posterior node of petiole not so much rounded 

 and dilated at the sides, and not contracted posterior as in soldier ; anterior 

 not depressed in centre above. Alidonien aciculated at the base. Otherwise 

 as in the soldier. 



Length, 3^-4 mm. 



Female. Black ; mandibles and antennal tubercles ferruginous ; knees, 

 and 4 anterior tiljiaj piceous, tarsi testaceous ; apex of last and l.)asal joint of 

 flagellum obscure ferruginous. Entii'e body densely covered with a greyish 

 or fuscous hair. Head at top smooth, obscurely aciculated, and bearing a 

 few punctures ; front longitudinally rugose : smooth in the centre : clypeus 

 shining. Mandibles black on inner liorder, shining, a few scattered punctures 

 on inner side : apex bidentate : thorax half-shining, alutaceous, metanotum 

 aciculated or punctured, sides finely punctured, a short, obscure keel on 

 mesonotum in front. Between the metathoracic spines (which are triangular, 

 acute at toj), and diverging) transversely striated ; metapleura3 below Icjiigi- 

 tudinally striated ; a carina on either side arising from the spines. Petiole 

 with a distinct neck at base, in front of 1st node, which is ol)Scurely trans- 

 versely striated below, aciculate above, depressed iir ceirtre of top ; 2ird 

 node broader than loirg, bulging out in the centre ; the griseous hair is 

 especially thick on petiole. Al^domen derrsely pilose, alirtaceous, segmental 

 divisions white. Antennce and legs covered with a white, stitf hair. 



Length, 7-8 mm. 



The worker varies considerably in coloration from light testace(jus to fuscous. 



In the table of the American species of Pheidole giverr by Mayr (Verh. z. 

 b. Wien, 1870, p. 981) the soldier comes iir at 176, rrear P. flavens, Rogers, it 

 having no frontal srrture : the worker at p. 984, near P. pusilla. In the form 

 of the head it approaches Aiiluenogaster. I am indebted to Prof Gustav 

 Mayr of Vienna for his opinion oir it. 



PSEUDOJIYRMA, Guer. 



11. Pseudomyrma gracilis, Fab., Syst. Piez., p. 405. 



Hah. Bodegas (level of sea) ; Pacific slopes (1-2000 feet). Two examples. 



Atta, Fab. 



12. Atta sexilens, Lin., Syst. Nat., i, p. 964: = sexdentata, Latr., Hist. Nat. 



Fourm., p. 228. 

 Hah. Pacific slopes (1-8000 feet). ^ 



