464 bulletin: museum of comparative zoology. 



Subopaque. Head regularly, rugosely punctate, each puncture 

 bearing a short, recumbent glistening white hair. Cheeks and 

 clypeus rugulose. Mandibles shining, coarsely punctured. Anten- 

 nae densely punctulate. Thoracic dorsum finely punctate; pleurae 

 shining; prothoracic pleurae densely punctate, meso- and epinotal 

 pleurae rugose. Node shining, rugose. First gastric segment densely, 

 irregularly striolate, the striolae longitudinal in front and transverse 

 at the posterior border; remaining segments very densely striolate 

 longitudinally. Legs somewhat shining, punctate. 



Thorax and gaster finely pubescent and wath scattered erect hairs. 

 Legs sparsely pilose. 



Color black; eyes, inner border of mandibles and tarsal joints red- 

 dish. Pilosity brownish. 



Described from several workers taken at Abuna. 



The curious structure of the petiole distinguishes this from the 

 other species of the subgenus. 



16L Dolichoderus {Monads) debilis Emery. 



Several workers from Madeira-Mamore Camp 37 agree closely 

 with cotypes received from Professor Emery. 



162. Dolichoderus (Moriacis) debilis Emery var. rufescens Mann. 



The single colony of this very distinct variety was found at Madeira- 

 Mamore Camp 39, living parabiotically with Odoniomachus affinis 

 subsp. mayi. It differs from Z). debilis in color, the greater length of 

 the petiolar spines, and the coarse cephalic sculpture. 



163. Dolichoderus (Hypoclinea) abruptus (F. Smith). 



Many specimens were taken at Porto Velho, Abuna, and Madeira- 

 Mamore Camp 41. The workers were found most frequently on 

 shrubs, where they attended Membracidae. 



164. Dolichoderus (Hypoclinea) lugens Emery, 



This species, originally described from Bolivia, swarmed in certain 

 parts of the forest near Porto Velho, and at Abuna, Brazil and Bolivia. 

 It forages on the ground more than do the other species of the genus, 



