HYMENOPTERA. 



103 



rufo-testaceous ; the mesothorax and scutellum longitudinally 

 striated, and having two oblique impressed lines which meet in 

 tlie middle. Abdomen elongate ; the apical margin of the first 

 segment constricted, the two basal segments finely longitudinally 

 aciculate, the third and following segments smooth and shining; 

 the apex of the abdomen pale rufo-testaceous. 



Hab. Brazil (Para; Santarem). (Coll. H. W. Bates.) 



The sexes of this si)ecies were taken from the nest by Mr. 

 Bates ; the females and workers do not vary much in colouring, 

 but the males differ considerably, some examples being entirely 

 pale rufo-testaceous. 



2. ECTATOMMA BRUNNEA. B.M. 



Female. Length 5 lines. — Deep red-brown : finely striated 

 and somewhat shining ; the striation on the head, mandibles and 

 mesothorax, longitudinal, that on the prothorax, nietathorax and 

 node of the peduncle, transverse ; the basal segment of the ab- 

 domen has a very tine curved striation as well as the second seg- 

 ment, on the latter it is very dehcate ; the apical margins of two 

 or three of the apical segments, as well as the apex itself, bright 

 shining rufo-testaceous; the node of the abdomen incrassate, 

 rounded and blunt at the apex ; the insect with short, scattered, 

 pale glittering hau's ; the wings flavo-hyaline, the nervures pale 

 testaceous ; the metathorax has two short teeth. 



Worker. — Rather smaller than the female, of the same colour 

 and similarly striated ; the thorax anteriorly produced into a 

 short sharp angular tooth on each side ; the metathorax has also 

 two short acute teeth ; the thorax is narrower and more elongate 

 than in the female, and the apical joints of the tarsi are pale tes- 

 taceous. 



Hab. Brazil (Santarem). 



This species, independent of its darker colour, is differently and 

 much more finely sculptured and striated than tuberciilata ; the 

 specimens of the latter have the head very coarsely grooved or 

 striated, the grooves with many transverse reticulations, the jjos- 

 terior angles of the vertex acute ; in E. brunnea they are rounded. 



3. EcTATOMMA CONCIXNA. B.M. 



Female. Length G lines. — Chestnut-brown : delicately and 

 evenly striated; the striation on the head, mesothorax, scutellum, 

 node of the peduncle and second segment of the abdomen is lon- 

 iritudinal, that on the ))rothorax is obliquely curved ; on the 

 metathorax and basal segment of the abdomen it is transversely 



