1925 ] 
New Neotropical Thysanoptera 
65 
Cryptothrips acuticornis sp. nov. 
Female , forma macroptera. — Length about 1 . 6 mm. Color 
nearly uniform dark brown, head somewhat darker than rest of 
body; tarsi, fore tibiae and articulations of legs paler, as is also 
the apical portion of segment 2 of the antennae and all of segment 
3 except the brown apex and a barely perceptible shading at 
basal two-fifths; segments 4 and 8 of antennae uniform dark 
brown. Head very slightly longer than wide, roundly converging 
from eyes to base; vertex tumid; eyes more than one-third as 
long as head, slightly more than one-half as wide as their interval; 
ocelli small, widely separated; postocular bristles blunt but not 
dilated at tip; postocellars and mid-dorsal pair minute. Segment 
8 of antennae long and slender, four times as long as greatest 
width, not pedicellate. Fore tarsi unarmed. Wings not narrowed 
at middle, brownish at extreme base; fore pair with 6 or 7 ac- 
cessory hairs and with only two subbasal bristles, which are 
blunt at apex. Prothoracic bristles all present, hardly pointed, 
the two pairs at posterior angles longest and subequal to post- 
oculars. Tube 0.9 as long as head, more than twice as long as 
width at base, which is somewhat less than twice the apicftl # 
Female , forma brachyptera. — Almost indistinguishable from 
the macropterous form save for the short wings. 
Male (brachypterous) . — Decidedly paler than female, the 
tube and head dark brown and the intervening portion brownish 
yellow, darker posteriorly. Fore tarsus armed. 
St. Croix and Barbados, West Indies; C. B. Williams; from 
grass. 
A true Cryptothrips. The structure of the terminal antennal 
segment is distinctive. 
Cryptothrips connaticornis sp. nov. 
Male (macropterous). — 'Length about 1.4 mm. Color 
bright yellow, with anterior part of head and all of prothorax 
brown; mesothorax brownish at sides and along anterior margin; 
abdomen lightly shaded with brown in basal three or four seg- 
