THE RED-BANDED THRIPS. 21 



CLASSIFICATION. 



Wlicn first doscriboil this insect was ])ut in the genus Physophus 

 and remained there until lOOS, when Frankhn ])hiced it in the genus 

 IleUothrips because of its stmcture, II. Karny °, in a revision of the 

 genus Hehothrips, made this species the type for a new subgenus, 

 Seienotlu'ips. However, for the jiresent, the writer prefers to refer it 

 to the genus Ileliotlmps in its okl sense. This species is readily 

 ])laced in this genus by reason of the downward curved ovipositor, 

 the reticuhited structure of the body, and the 8-segmented antennas 

 with segment 8 longer than 7, and the spines on the wings pointed. 



DESCRIPTION. 

 THE ADULT. 



(PI. V, fig. 1.) 



As an adult this insect can be separated from others associating 

 with it by the characters given above and by the black body, dark 

 wings, the reddish band, evident in the first three segments of the 

 abdomen, and the red color of the anal segment. The adult female 

 (Pi. V, fig. 1) is about one twenty-fourth of an inch long (1.1174 mm.) 

 and quite stout. The color is dark brown or black.^ The male is 

 much smaller and is apparently not very commonly collected. When 

 the adults first emerge, the colors of the body are light, but in a short 

 time these darken and the mature colors appear, 



THE EGG. 



The egg was not observed by the writer, but was described by F.W. 

 Urich,^^ as follows : 



As dissected out of the female the egg i.s kidney-shaped, 0.255 mm. long and 

 0.105 mm. wide, with a Aery thin shell and transparent. 



The eggs are inserted by the female into the tissues of the mango or 

 avocado leaves and in the case of the cacao, as observed by Urich, in 

 the leaves and pods of the bean as well. 



THE FIRST-STAGE LARVA. 



The following description was made while the larva was less than 

 a day old and before it had begun to feed: 



Length about 0.25 mm. and nearly six times as long as wide. General shape fusi- 

 form; head, antennae, and legs ver>' large in proportion. Head quadrate, rounded in 

 front, light yellow in color; ocelli absent, eyes red, antennae seven-jointed, hyaline; 

 legs and body hyaline; segments 1 and 2 of abdomen crossed by a bright red band, 

 anal segment red; end of abdomen with four long hairs about four times as long as 

 segment 10. 



a Ent. Rundschau. Jalirg. 2S, pp. 179-181, Deccmbor, 1911. 



i> For full description of this species see Franklin's paper, 18 pp. 7l9-72i 



57371°— Bull. 99—12 2 



