365 
mm., width at base .057 mm., at apex .032 mm. Antenne: 1, 24 uy; 
2,44 w;-3, 44 w; 4,46 w;5, 45 w; 6, 41 w; 7, 38 w; 8, 24 uw; total, .30 mm. 
Described from a single brachypterous female taken by the writer 
in a gall on Solidago, at Carbondale, Hlinois, June 20, 1907. 
LISSOTHRIPS gen. nov. 
(Acooos, smooth; Ooed, thrips.) 
Head slightly wider than long, sub-globose, narrowed posteriorly ; 
eyes directed forwards; cheeks full, sparsely spinose. Antenne about 
twice as long as head, eight-segmented; segments 1 and 2 broadest; 3 
very small, shorter and narrower than any of the following segments, 
excepting the distal one; 7 longest. Mouth cone broad, pointed, sur- 
passing base of prosternum. Prothorax shorter than head, with five 
pairs of very long bristles. Fore tarsi unarmed. 
This genus 1s closely related to Cephalothrips Uzel, but the longer, 
pointed mouth cone and the structure of the antenne are sufficiently 
distinctive to warrant the erection of a new genus. 
Lissothrips muscorum sp. nov. 
Female.—Length about 1.17 mm. Color blackish brown to black, 
legs and antennal segments 1 and 2 paler. 
f Eyes moderate in size, coarsely faceted, situated on anterior surface 
of®head. Ocelli lacking. Postocular spines long, blunt, expanded 
distally. 
Prothorax three-fourths as long as head; spines slightly expanded at 
tips ;{mid-lateral spines and the pair at the posterior angles almost as 
long as prothorax. Pterothorax about as long as, and shghtly narrower 
than prothorax; mesonotum with one long spine at each posterior angle. 
t= Abdomen one and one-third times as wide as prothorax; posterior 
borders of abdominal segments 2—9 each with two pairs of very long, sub- 
equal, pointed bristles, some twice the length of the abdominal segments. 
&§ Measurements:——Total length about 1.17 mm.; head, length .16 
mm., width .17 mm.; prothorax, length .12 mm., width (including coxe) 
.28 mm.; pterothorax, width .26 mm.; abdomen, width .36 mm.; tube, 
length .12 mm., width at base .070 mm., at apex .034 mm. Antenne: 
1 25s 2, 43 pw: 3, 32 i: 4, AD 5, 42 ps; 6, 46 pf; 7,48 w; 8, 36 yw; tatal, 
Roope acts ate : 
Described from several apterous females, from Arcola, Dubois, 
Mahomet, Marion, Muncie, Pulaski, and Urbana, Illinois, taken in 
mMOSsS. 
