CRAWFORD. THYSANOPTERA OF MEXICO AND THE SOUTH 165 



enlarged, briefly spinose ; with a terminal tarsal hook in both sexes ; middle 

 and posterior tarsi with a fringe of spines on apical margin of both segments. 

 Wings medium, reaching to seventh abdominal segment, clear from base to 

 tip, very slightly narrowed at the middle ; posterior fringe, subapically, double 

 for about seven cilia. 



Abdomen long and slender, tapering evenly from base to tip ; spines not 

 conspicuous; tube short, less than half as long as head, converging toward tip; 

 with a few comparatively short spines at tip of ninth segment, and si.x short 

 stout spines at tip of tube, and a few shorter and more slender ones also. 



Measurements: Head, length .31 mm., width .18 mm.; prothorax, length 

 .12 mm., width (including coxae) .23 mm.; pterothorax, width .32 mm.; abdo- 

 men, width .36 mm.; tube, length .13 mm., width, at base, .065 mm., at tip .035 

 mm.: total length 2.28 mm. Antennse : I. .030 mm.; II, .055 mm.; Ill, .071 

 mm.; IV, .077 mm.; V, .061 mm.; VI, .050 mm.; VII, .041 mm.; \'III, .028 

 mm. ; total .39 mm. 



Males smaller, Iiut relatively stouter than female; head (Fig. 68 A) dis- 

 tinctly shorter, about one and four-tenths times as long as broad ; terminal 

 tarsal hook larger in male ; prothorax relatively broader, abdomen more slen- 

 der ; tube almost alike in both se.xes ; with a closely lying scale at base of 

 tube. 



Measurements: Head, length .24 mm., width .17 mm.; prothorax, length 

 .12 mm., width .26 mm. ; ])terothorax, width .32 mm. ; abdomen, width .34 mm. ; 

 total length 2.11 mm. 



Described from four females and four males, taken from galls ( Fig. 68 

 F, G) on the stems and leaves of a certain bignoniaceous shrub, and also from 

 sweepings on other shrubs. 



Locality: Guadalajara, Mex. (Crawford). 



I name this species for Mr. R. A. McConnell, who accompanied me on 

 an expedition to Mexico in July-September, 1909. 



This species could have been included in Leptothrips Hood about as truly 

 as in Liothrips, which shows how much of a line of true demarcation there is 

 between these two genera. The diagnostic characters of Leptothrips. distin- 

 guishing it from f.iotlirips. are given by Hood as being "the much slenderer 

 form, the longer head, the more bulging eyes, the shorter mouthcone. the 

 weaker, slenderer wings which are distinctly narrowed at the middle." This 

 group I if characters, taken together, might be enough to erect a new genus on, 

 but one can see at a glance that such characters could hardly be con.stantly asso- 

 ciated. In Liothrips iiiccoiniclli there are the combined characters of botn gen- 

 era : of Leptothrips — the slender form and relatively long head of the females, 

 and a short mouthcone; of Liothrips — the relatively stouter form and shorter 

 head of the males, eyes not at all bulging, while the wings are only slightly 

 constricted at the middle. Again, in Liothrips bakcri there are still further 

 complications ; this species has the slender form, rather long head, and bulging 

 eyes cliaracteristic of Leptothrips, and broad wings not constricted, and the 

 large mouthcone characteristic of Liothrips. The constriction of the wings, 

 therefore, is the only character presented, which is of generic value, and this 



