122 AMERICAN HYMENOPTERA. 



lines. Scutellum and postscutellum somewliat more finely punctured. First 

 segment of abdomen with a few punctures in the middle, otherwise perfectly 

 smooth, two and three finely and closely punctured, remaining segments rugose, 

 six with a prominent brush of light hairs. Apical plate very narrow, as in 

 acantha and nanula. Legs green, tarsi fulvous at tip. Knees with a white dot, 

 anterior tibise with a white line extending entire length. Tubercles white. 

 Wings hyaline, strongly iridescent. 



Described from two males from Sunbury, Pennsylvania, sent to 

 me by Mr. C. F. Baker. 



Ceratiiia abdoininalis u. sp. 



% . Length 7 mm. — Body shining, head and thorax dark bluish-green, some- 

 times feneous. Abdomen a brilliant coppery hue. Face with coarse, rather 

 sparse punctures, quite irregular, clypeus impunctate. Antennae black. Clypeus 

 excepting the narrow reflexed anterior margin, a triangular space on the face on 

 each side of the clypeus, and a quadrate spot in the middle of the labrum, yellow. 

 Mandibles wholly black, or with the tips reddish. Labrum coarsely and sparsely 

 punctured, clothed with a few pale hairs. Cheeks and occiput quite closely punc- 

 tured, excepting a narrow impunctate area just behind the eyes. Posterior mar- 

 gin of the occiput strongly reflexed. Thorax finely punctured, disk impunctate 

 and blackish in color, with five short, impressed longitudinal lines. Scutellum 

 finely punctured, postscutellum more closely so, sometimes brassy-green in color. 

 Dorsal portion of metathorax irregularly longitudinally striated, the truncation 

 extremely minutely punctured, posterior face closely punctured above, more 

 sparsely so below. Pleura with good sized punctures, about as far apart as their 

 diameters, and clothed with sparse white pubescence. Tubercles concolorous 

 with rest of thorax. Abdomen bright coppery, first segment impunctate, except 

 on the disk, second and third segments finely punctured, remaining ones some- 

 what rugose. Venter brassy-green, closely punctured, each segment with a fringe 

 of white hairs, tip of abdomen also with long pubescence, penultimate dorsal 

 segment with a short median brush. Apical plate truncate, almost twice as broad 

 as long, corners well rounded. Legs green, pubescent, tarsi ferruginous, with 

 light fulvous pubescence on inner side. Wings dark smoky, strongly iridescent, 

 tegulie piceous. 



9. Dilfers from the % as follows: length 8 mm., head proportionately some- 

 what wider than in % ; clypeal marking consists of an obconic yellow spot, no 

 lateral face marks, or marks on labrum; clypeus with a few coarse punctures. 

 Apex of abdomen pointed. 



Type. — I and 9, Monte Redunda, Costa Rica, March, 1902. 

 Thirty-two paratypes from above locality and Juan Vinas (L. 

 Bruner), and one from San Marcos, Nicaragua (C. F. Baker). 



Ceratina auriviridis n. sp. 



9. Length 4.5-6 mm. — Brilliant peacock-green throughout, with bright 

 golden reflections. Face with a very few broad, deep punctures, irregular in 

 shape and size. Clypeus medially and spaces above lateral portions of clypeus 

 impunctate, also a large space lateral to and above the antennae extending to a 

 line passing behind the lateral ocelli ; a row of punctures form a V in front of 



