IOWA ACADEMY OP SCIENCES. 
215 
FAM. II. STENOPTERID^ . 
A. Body above netted with elevated lines... Gen. 2. Heliothrips. 
AA. Body above smooth. 
B. Abdomen clothed with silky hairs; apex conical, formed alike in 
both sexes. Gen. 3. Sericothrips. 
BB. Body smooth; apex of abdomen unlike in the two sexes. 
C. Prothorax produced in front, and narrowed 
Gen. 4. Chirothrips. 
CC. Prothorax not produced in front and narrowed. 
D. Last segment of abdomen with a pair of spines in female; 
male, wingless Gen. 5. Limothrips. 
DD. Last segment of abdomen unarmed. 
E. Last two segments of antennae shorter than the sixth 
segment Gen. 6. Thrips. 
EE. Last two segments of the antennae longer than the 
sixth segment Gen. 7. Belothrips. 
FAM. III. COLEOPTRATID^. 
A. Antennae with nine distinct segments Gen. 8. Melanthrips. 
AA. Antennae apparently five jointed, the last four segments being 
minute and compact 
B. Body somewhat flattened; meso-metathorax broad; front wings 
without fringe on costal border, and with four distinct cross 
veins; males with lateral abdominal appendages 
Gen. 9. Coleothrips. 
BB. Body cylindrical, mesothorax and metathorax constricted, wings 
rudimentary Gen. 10 Aeolothrips. 
SYNOPSIS OP IOWA SPECIES. 
GENUS PHLCEOTHRIPS, HAL. 
A. Proximal joint of anterior tarsi armed with a tooth on inner side ..1 
A A. Proximal joint of anterior tarsi unarmed.. 2 
1. With postocular bristle; three bristles on each side of pro- 
thorax; antennal joints 3-6 yellow verhasci, Osb, 
Without postocular bristle; a single bristle at each posterior 
angle of prothorax; antennal joint 3 and base of joint 4, some- 
times base of joint 5, yellowish.. oigra, Osb. 
2. Black; head slightly longer than wide; tube three times as 
long as wide caryie, Pitch, 
Purplish-black; head one and one-half times as long as wide; 
tube twice as long as wide mali, Pitch. 
Phloeothrips verbasci, Osb. 
Description follows this paper. 
Phloeothrips nigra, Osb. 
Can. Ent., Vol. XV, p. 154 [1883]. 
Phloeothrips caryoe, Fitch. 
[Third Report.] Trans. N. Y. State Agr. Soc. for 1856, Vol. 
XVI, p. 446. 
