120 AMERICAN HYMENOPTERA. 



V . Differs from the male as follows : size somewhat larger ; clypeus with only 

 a rectangular ivory-white mark ; labrum and sides of face entirely dark ; thorax 

 more closely punctured ; abdomen pointed at apex. 



Described from 6 males and 2 females taken at Fedor, Lee Co., 

 Texas, March and April, 1902, by Rev. G. Birkmann. 



This species and the following one are the second and third black 

 species described from North America, the only other described spe- 

 cies being C. arizonensis Cockerell. The name lunata refers to the 

 crescent- shaped apical plate of the male. 



Ceratina atrata n. sp. 



% . Length 3.5 mm.— Body shining black. Face impuuctate, clypeus with 

 the usual ivory-white T-shaped mark, the central arm about twice the length of 

 the lateral ones, that portion of the face above them with a minute white dot. 

 Labrum brownish with a median white patch, mandibles black, rufous toward 

 the tips. Cheeks almost entirely impunctate, occiput with a very few irregular 

 punctures. Antennse brownish-black. Mesothorax with a narrow border of 

 punctures, but smooth on disk excepting the longitudinally impressed lines. 

 Scutellum and postscutellum finely punctured, metathorax still more finely so. 

 First abdominal segment impunctate, remaining segments with fine punctures, 

 the apical plate broad, with corners rounded and with a sharp point at the apex, 

 like the lower edge of a shield, and finely punctured dorsally. Tenter having 

 segments fringed with silvery hairs. Legs black, tarsi ferruginous, anterior 

 tibise with a broad white stripe in front. Tubercles white. Wings subhyaline, 

 strongly iridescent, nervures and stigma dark brown. 



9. Differs from the % in having only a broad rectangular stripe on the cly- 

 peus, no white on the labrum, and in the sparsely punctured scutellum. 



Described from a pair from Belize, British Honduras, sent to me 

 by Mr. C. F. Baker. 



Ceratina bakeri n. sp. 



% . Length 3 mm.— Dark bluish-green. Face comparatively very narrow, 

 coarsely punctured, the punctures very sparse directly above the clypeus. 

 T-shaped clypeal mark with central arm much longer and wider thau lateral 

 ones. Labrum whitish, with a black spot on each side. Mandibles lighter at tip. 

 Cheeks sparsely but deeply punctured, occiput densely so. Mesothorax quite 

 densely punctured, with three indistinctly impressed longitudinal lines. Scu- 

 tellum and postscutellum finely and closely punctured. Superior face of meta- 

 thorax longitudinally striate, posterior face punctate. First segment of abdomen 

 almost entirely smooth, second and third finely punctured, remaining segments 

 rugose, fringed with quite long whitish hairs. Apical plate shaped similarly to 

 that of C. diodonta, the two teeth not so distinct, however. Legs green, tarsi fer- 

 ruginous. Anterior tibise with a pale stripe running two-thirds of the way to 

 base of tarsus, knees white. Tubercles white, wings hyaline, strongly iridescent. 



Related to C. diodonta, hut easily separated by the much narrower 



face and difference in sculpture. 



