Or 
SPRING NUMBER 
tip; hind vein bears 7 spines which are more widely separated toward tip 
than toward base of wing. ; 
Abdomen stout. Eighth segment with a comb of spiniferous tubercles 
on dorsal posterior margin. Last three segments sharply conical. A small 
spine at posterior angle of 7th segment, a larger one on posterior angle 
of 8th. segment; the 9th bears six long, light brown spines across its pos- 
terior margin. .The spines on 10th segment nearly as long as those on 
9th. 10th segment split open above. 
Measurements—holotype:—Length 0.965 mm.; head, length 0.112 mm., 
width through eyes 0.13 mm.; prothorax, length 0.122 mm., width 0.14 mm.; 
mesothorax, width 0.20 mm.; metathorax, width 0.179 mm.; abdomen, width 
at middle 0.286 mm.; length of antennal segments in microns: 
[Pt | ees Sra: ae ie ai Ore ta ees 
(Ges [= 30 - |" S25 1 P34 SP ee ana aALO ices ats 
Described from 4 females collected on cane, Bayamon, Porto Rico, 
May 5, 1920, by G. N. Wolcott. 
LISSOTHRIPS HOOD 
PROLISSOTHRIPS NEW SUBGENUS 
Head slightly wider than long, quadrate, very slightly narrowed pos- 
teriorly; eyes larger than in Lissothrips and directed more laterad; anten- 
nae as in Lissothrips, except that sixth segment is slightly longer than 
seventh. Mouth cone broad and sharp-pointed at tip, extending only 3/4 
across prosternum. Labium broad and broadly rounded. Prothorax very 
slightly shorter than head, the five pairs of bristles very noticeably 
‘expanded at tips and much shorter than in Lissothrips. Fore tarsi 
unarmed. Most of the abdominal spines expanded at tips. 
The shorter mouth cone, the shorter and more expanded spines and 
the quadrate head suggests a genus distinct from Lissothrips, but since the 
only specimen known is a male, I hesitate to give it generic rank, preferring 
to place it in a subgenus under Lissothrips, to which it is so very closely 
allied. 
Lissothrips (Prolissothrips) stratulus sp. nov. 
Male:—General color uniform dark brown, with scarcely any shading, 
except for second antennal segment, which is slightly lighter and the 3rd 
antennal segment, which is gray. 
Head, quadrate, about 1/4 wider than long, cheeks slightly roughened 
and slightly convex. Eyes directed somewhat laterad, occupying about 
half the width of the head and 1/3 its length. Ocelli wanting. Post ocular 
bristles of medium length and markedly expanded at tips. Mouth cone 
pointed at tip and reaching 3/4 across prosternum, labium broad and 
broadly rounded, over-reaching the mouth cone. 
Prothorax a little shorter than head, measured through coxae 2 1/2 
times as broad as long and 1 2/3 times as broad as at anterior margin; 
bearing five pairs of well-developed spines—not nearly as long as those 
of Lissothrips muscorum— which are markedly expanded at tips. Meso 
and metathorax about 4/5 as wide as prothorax through coxae. Mesonotum 
