﻿CRAWFORD, THYSANOPTERA OF MEXICO AND THE SOUTH 157 



thorax large, broadest across mesocoxae, broadly rounded anteriorly, nieta- 

 thorax tapering slightly to abdomen. Legs medium, very spinose ; forefemora 

 not enlarged ; femora concolorous with body ; tibiae lighter, tarsi yellowish 

 brown. Wings (Fig. 64 D) not very long, reaching about to seventh abdominal 

 segment ; basal one-fourth clear, the rest light brown ; posterior vein extending 

 from apical margin of clear area to near tip, with twenty spines ; anterior vein 

 with twenty-nine spines, anterior margin with thirty-two spines increasing in 

 length toward the tip, and a short fringe of cilia on apical half; posterior 

 margin with a long double fringe of cilia. Posterior wings clear white with a 

 narrow longitudinal median stripe from base to near tip. 



Abdomen large, moderately broad, broadest across fourth and fifth seg- 

 ments ; with several long spines on each posterior angle and margin ; last three 

 segments (Fig. 64 C) abruptly converging to tip; posterior dorsal margin of 

 eighth with a row of long sharp comb-like spines ; nine and ten with several 

 very long stout bristles on dorsal surface. 



Measurements: Head, length .16 mm., width .18 mm.; prothorax, length 

 .145 mm., width anteriorly .205 mm., posteriorly .19 mm.; pterothorax, width 

 .17 mm.; abdomen, width .29 mm.; total length 1.55 mm. Antennae: I, .026 

 mm. ; II, .040 mm. ; III, .087 mm. ; IV, .071 mm. ; \', .043 mm. ; VI, .072 mm. ; 

 VII, .009 mm.; VIII, .014 mm. ; total .37 mm. 



Described from one female taken on blossoms of a native Acacia-like tree. 



Locality: Guadalajara, Mexico. (Crawford.) 



Thrips abdomiuali.s n. sp. 



Average length 1.0 mm.; general color light brown; body surface reticu- 

 lated; all spines very inconspicuous. 



Head (Fig. 65 A) about one and one-half times as broad as long, angtilar, 

 markedly retractile, reticulated posteriorly ; frons vertical ; cheeks parallel ; 

 with no prominent spines, but several very small and inconspicuous ones near 

 the eyes and ocelli. Eyes large, prominent, bulging, finely faceted, and slightly 

 pilose ; anterior ocellus on frons and directed forward ; posterior ocelli on the 

 sides of an elevated portion between the eyes and directed outwardly, slightly 

 higher up than the eyes. Mouthcone short and blunt, reaching one-third the 

 length of prothorax; maxillary palpi three-segmented. Antenna (Fig. 65 B) 

 more than twice as long as head, quite stout, with spines short and incon- 

 spicuous ; with a sense cone on segments III and IV, and several small sensory 

 areas on VI ; II distinctly stouter than the rest. III pedicellate ; V very broad 

 at apical end; VII comparatively long; I, II, IV, VI and MI concolorous with 

 body. III and V somewhat lighter. 



Prothorax (Fig. 65 A) one and one-half times as long as head, and one 

 and one-fourth times as long as broad, posteriorly ; sides strongly divergent, 

 with angles rounded; with no prominept spines, but a row of ten very small 

 spines on anterior dorsal margin, and eighteen on posterior margin, two on 

 each posterior angle larger than the rest ; with a distinct dark emargination and 

 chitinous thickening on each side above the fore-coxae. Legs small, short, 

 Avitli no conspicuous spines, except two at tip of posterior tibiae ; fore-femora 



