SL: 
Mouth cone large, broadly rounded, 
reaching base of prosternum; la- 
bsum “blunt. ~Prothorax short, 
about two-thirds as long as head, 
and armed with six pairs of knob- 
bed bristles. Legs short, stout; 
fore tarsi unarmed. 
This genus is the only one of 
its family (excepting Kladothrips 
Froggatt) which has seven-seg- 
mented antenne. The reduction 
in the number of antennal seg- 
ments is a result of the union of 
the two apical ones, and the whole 
antenna is an exaggeration of the 
type indicated by Neothrips gen. 
nov., in which a separating suture 
is still distinctly visible. 
; Fic. 7 
Allothrips megacephalus Allothrips megacephalus, female, apterous form. 
= = a, head and prothorax; 6b, right antenna, 
Sp. NOV. (Fig. ie dorsal view! c,tipofabdomen. (J. D.H., del.) 
Female.—Length about 1.3 mm. 
Color dark blackish brown, with maroon-colored hypodermal pigmen- 
tation; tarsi, tube, and antennal segments 1 and 2 slightly lighter. Ab- 
domen broad, about one and one-half times as wide as prothorax. 
Forma aptera.—Eyes very small, consisting of a few large lateral 
facets. Ocelli lacking. Pterothorax about as long as prothorax; meso- 
notum transverse, sub-rectangular, with six equidistant knobbed bristles 
along its posterior border, and with an additional similar pair near the 
posterior angles. 
Measurements:—Total length 1.31 mm.; head,. length .21 mm., 
width .20 mm.; prothorax, length .14 mm., width (including coxe) .30 
mm.; pterothorax, width .30 mm.; abdomen, width .45 mm; tube, 
length .12 mm., width at base .082 mm., at apex .044 mm. Antenne: 
1,38 4; 2,57 w; 3,51 4; 4, 41 4; 5, 44 456, 44 pw; 7, 67 w; total, .34 mm. 
Forma brachyptera.—Eyes moderately large, coarsely faceted. Ocelli 
present; a pair of long knobbed bristles behind the posterior ones. 
Pterothorax about twice as long as prothorax; mesonotum sub-pentago- 
nal, with two pairs of knobbed bristles along its posterior border. Wings 
attaining base of abdomen. 
Described from several females, one of them brachypterous, taken 
under bark on various trees at Urbana and Springfield, Hlinois, in 
winter. 
