166 Proceedings of the Biological Society of Washington. 
Aljdomeii .slightly wider than pterotliorax. Tube equal in length to 
head and 2.5 times as long as basal width, which is three times the 
apical; sides straight. Abdominal bristles pointed, tho.se on .segment h 
longer than tube; terminal bristles about lialf as long as tube. 
Measurements of holotype: Length 3.65 mm.; head, length .540 mm., 
width .331 mm.; ])rothorax, length along median dorsal line .186mm., 
width (inclusive of coxje) .70S mm.; pterotliorax, width .732 mm.; 
abdomen, width .804 mm.; tube, length .540 mm., width at ba.se .2I(i 
mm., at apex .070mm. Antennal segments; I, 111/i; 2, 09m; 3, length 
165m, width 60m; 4, length 204m, width 66m; 5, 201 m ; 6, 1.53m: 7, 100m; 
8, 04m; total length of antenna 1.13 mm. 
Described from one female taken at liockstone, Lritish Guiana, Feb¬ 
ruary 28, 1013, 1)3' Mr. G. E. Bodkin, Government Economic Biologist. 
Diceratothrips picticornis sp. mn’. 
f Plate 5, figs. 1 and 2.) 
female (macropterous).—Length about 3.1 mm. Color nearly piceous 
black, with knees, bases of femora, and first three antennal segments, 
3 'ellow. 
Head subrectangular, 1.28 times as long as wide, truncate in front; 
cheeks nearly parallel, very slightly arcuate, equall}' converging to eyes 
and to an abrupt collar-like basal widening about one-fourth as long as 
eye; tlorsal and lateral surfaces with faint anastomozing lines, sparsely 
.spinose, a ]>air of stouter spines at basal and a|)ical thirds, respective!}’; 
postocular bristles jxjinted, about 1.6 times as long as eyes; a pair of 
prominent, stout bristles on front near eyes, half as long as postoculars. 
Eyes about one-fourth as long as bead ; inner margins nearl}’ straight, 
subparallel, forming a broadly rounded acute angle with the posterior 
inargins. Ocelli moderately large, their dianuder about twice as great as 
that of facets ol e 3 ’es; anterior ocellus situated on extreme vertex, sligbtl}’ 
overlianging and pointing directly forward; i)osterior ocelli widely .sei)a- 
rated, nearly contiguous to margins of eyes. Antemue inserted beneath 
vertex, 2.1 times as long as head; segments 3-5 claviform, elongate, ;> 
more than four times as long as its greatest subapical width; 6 and 7 
oblong, pedicellate; 8 .subconical; sense cones and bristles short. Color 
of antemue: .Segments 1-3 yellow, 1 slightly clouded at base with brown, 
3 dark brown in apical seventh ; 4-8 dark blackish brown, 4 i)aler in basal 
three-fourths. 51outb cone broadly rounded at apex, reaching well be¬ 
yond middle of prosternum. 
Prothorax along median dor.sal line about .56 as long as head and (in¬ 
clusive of coxm) about 2.6 times as wide as long, .sides nearl}’ straight, 
.surface nearly smooth; anterior angles not at all produced; usual spines 
all present, the ])air at the ])osterior angles longest, slightly longer than 
postoculars; posterior marginals and coxals subequal in length, half as 
long as postoculars; other bristles minute, about as long as those on 
cheeks. Pterotliorax slightly wider than prothorax, sides slightly arcuate 
and convergent posteriorly. Wings long and broad, closely fringed, 
