INSECUTOR INSCITI/S; MENSTRUUS 3 



length 0.612 mm., width at base 0.075 mm., at middle 0.036 



mm. ; abdomen, width 0.324 mm. 



Antennal segments .... 1 2 3 4 5 



Length i\x) 20 32 66 42 24 



Width (n) 27 27 23 23 16 



Total length of antenna, 0.257 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 0.840 mm. ; head, length 

 0.108 mm., width 0.163 mm.; prothorax, length 0.132 mm., 

 width 0.233 mm.; pterothorax, width 0.252 mm.; fore wing, 

 length 0.564 mm., width at base 0.072 mm., at middle 0.034 

 mm. ; abdomen, width 0.240 mm. 

 Antennal segments .... 1 2 3 4 5 



Length (n) 20 33 70 40 23 



Width {\i) 29 25 23 22 15 



Total length of antenna, 0.361 mm. 

 Described from 12 females and 21 males "taken in the 

 blossoms of an undetermined plant," at Rio Piedras, Porto 

 Rico, August 10, 1914, by Thomas H. Jones. 



Allied to decacornis Crawford by the type of armature of the 

 abdominal tergites and the antennal coloration, but differing 

 from that species conspicuously in the much shorter pedicel 

 of the third antennal segment. It is named after the Island 

 of Porto Rico which, when Ponce de Leon landed on its 

 western coast in 1508, was called by the Indians the Island of 

 Borinquen. 



Heterothrips flavicornis, new species. (PI. I, figs. 2 and 3.) 

 Female (macropterous). — Length about 1.1 mm. Color dark 

 blackish brown, with tarsi, proximal and distal ends of mid 

 and hind tibiae, all of fore tibiae, tip of fore femora, and an- 

 tennae except for extreme base and apex, lemon yellow. 



Head about 1.6 times as wide as median dorsal length and 

 0.7 as long as prothorax, widest just behind eyes, thence 

 narrowing abruptly to eyes and tapering concavely to base; 

 surface with a few minute spines, impressed and transversely 



