INSECUTOR INSCITI^ MENSTRUUS 5 



plates whose apical margins are produced into many very fine, 

 slender spines. 



Measurements of holotype: Length 1.10 mm.; head, length 

 0.110 mm., width 0.174 mm.; prothorax, length 0.156 mm., 

 width 0.262 mm. ; pterothorax, width 0.300 mm. ; fore wing, 

 length 0.720 mm., width at base 0.091 mm., at middle 0.041 

 mm. ; abdomen, width 0.360 mm. 



Antennal segments 1 2 3 4 5 6 7 8 9 



Length (n) 28 39 73 46 30 28 17 17 19 



Width (n) 31 28 24 24 19 15 11 10 7 



Total length of antenna, 0.297 mm. 

 Male (macropterous). — Length about 0.8 mm. Color and 

 structure essentially as in female. Tergite of abdominal seg- 

 ment 9 with two pairs of long, strong bristles behind middle. 

 Measurements of allotype : Length 0,792 mm. ; head, length 

 0.085 mm., width 0.160 mm.; prothorax, length 0.152 mm., 

 width 0.240 mm. ; pterothorax, width 0.252 mm. ; fore wing, 

 length 0.588 mm., width at base 0.079 mm., at middle 0.035 

 mm. ; abdomen, width 0.192 mm. 



Antennal segments 123456789 



Length ([x) 24 33 64 45 28 27 18 17 20 



Width (ji) 30 26 22 22 17 15 11 8 6 



Total length of antenna, 0.276 mm. 

 Described from 79 females and 36 males taken with Hetero- 

 thrips minor sp. nov., in the flowers of a tree (Byrsonima 

 crassifoliaf), at Sona, Panama, April 22, 1914, by Mr. James 

 Zetek. 



Distinguished from all other known species of the genus by 

 the antennal colorations. 



Heterothrips pectinifer, new species. (PI. I, fig. 7.) 



Female (macropterous). — Length about 1.2 mm. Color 

 dark blackish brown, with tarsi, distal ends of tibiae, and third 

 antennal segment grayish yellow; fourth antennal segment 

 distinctly paler than fifth and with a pale band at apex and 

 another just basal to middle; fore wings dark brownish gray, 

 except for a white transverse band just beyond scale. 



Head about 1.3 times as wide as median dorsal length, dis- 



