﻿CRAWFORD, THYSANOPTERA OF MEXICO AND THE SOUTH 167 



slightly broader than long, and more rectangular, and sometimes it is distinctly 

 longer than broad ; very seldom the head is more or less narrowed anteriorly 

 (Fig. 69 A) — partially caused by the collapsing of the eyes; cheeks full, 

 sparsely spinose ; vertex slightly elevated, and distinctly produced, but not 

 attaining the insertion of the antennae; postocular spines moderately long, and 

 blunt at the tip. Eyes medium, finely faceted and slightly pilose, pigment 

 almost white ; ocelli large and distinct ; anterior ocellus on apex of produced 

 vertex and directed forward; posterior ocelli not quite contiguous with inner 

 anterior margin of eyes. Mouthcone short and blunt, scarcely reaching half 

 the length of prothorax. Antennae (Fig. 69 C) about twice as long as head, 

 very stout and thickly, but briefly, spinose ; segments II-VII distinctly pedicel- 

 late and subglobose; II-V with spotted sense cones, or sometimes transparent; 

 I, base of II, and VII and VIII concolorous with body, intermediate segments 

 yellowish brown or lemon yellow. 



Prothorax (Fig. 69 A) including coxae, twice as wide as long, and about 

 seven-ninths as long as head ; with all the usual prothoracic spines present, 

 long and blunt at tip ; dorsal surface slightly spinose. Pterothorax widest 

 across mesocoxae, converging both anteriorly and posteriorly, partially reticu- 

 lated. Wings moderately long, broadest at base, and distinctly narrowed be- 

 yond the middle like a drawn-out shoesole ; scale and extreme base light 

 brown ; with a short median vein at base, bearing three long spines and one 

 short one ; posterior fringe double subapically for eight cilia. Legs medium, 

 moderately stout, sparsely spinose; foretarsi (Fig. 69 E) with a small tooth 

 near the middle, within, and a terminal tarsal hook ; foretibiae and foretarsi 

 light yellow, the rest concolorous with body. 



Abdomen long, slender, very weak, tapering evenly from base to tip ; with 

 two prominent spines on each posterior dorsal angle ; tube ( Fig. 69 B ) about 

 as long as prothorax, seven-ninths as long as head, converging toward tip ; with 

 six long spines at tip, and several shorter ones. 



Measurements: Head, length .17 mm., width .165 mm.; prothora.x, length 

 .13 mm., width .26 mm. ; pterothorax, width .31 mm. ; abdomen, width at base 

 .32 mm.; tube, length .13 mm, width at base .05 mm., at tip .03 mm.; total 

 length 1.64 mm. Antenna: I, .024 mm.; II, .047 mm.; Ill, .038 mm.; IV, 

 .050 mm. ; width .031 mm. ; \', .049 mm. ; VI. .040 mm. ; VII, .042 mm. ; VIII, 

 .024 mm. ; total .33 mm. 



Males smaller than females, but similar in nearly all respects ; abdomen 

 more slender, tube shorter; average length of male 1.46 mm. 



Described from numerous females and several males. 



Food plants : Celosia, Dodder, and a native tropical creeping vine. 



Localities: Santiago de las Vegas, Cuba (C. F. Baker) ; Managua, Nica- 

 ragua (C. F. Baker), and Guadalajara, Mexico (Crawford). 



The abdomen was described as being weak, because of the fact that in 

 many, perhaps the majority, of the specimens used in this study the abdomen is 

 constricted in several of its basal segments, probably by the action of the 

 reagents used in the preparation of the mounts. 



