64 Bulletin of the Brooklyn Entomological Society Vol. XI 



(EDALEOTHRIPS HOOKERI, A NEW GENUS AND SPECIES 

 OF THYSANOPTERA. 



By J. Douglas Hood, U. S. Biological Survey. 



(Edaleothrips gen. nov. 

 (oi8d\4os, turgid; 0p^i^, a wood worm). 



Head about one and one half times as long as wide, much narrowed at 

 base and broadest across eyes, about twice as long as pronotum and about 

 equal in width to pterothorax ; vertex rugose ; postocular bristles short, 

 sublateral, equal in length to a forwardly-directed pair near base of an- 

 tennse. Anteftnse eight-segmented, segments 4-6, with ventral prolonga- 

 tions at apex; segment 3 longest. Eyes rather small, flattened, protrud- 

 ing, produced posteriorly on ventral surface of head, widely separated. 

 Mouth cone short, semicircularly rounded at apex, about attaining middle 

 of prosternum. Prothorax unusually narrow and about two thirds as 

 long as wide; usual bristles all present but reduced in size. Pterothorax 

 greatly reduced, about as long as broad and about equal in width to head. 

 Fore tarsi armed with a short, stout tooth. Wings wanting in the geno- 

 type. Abdomen broad and heavy, with dorsal white blotches ; tube about 

 half as long as head. 



Genotype : (Edaleothrips hookeri sp. nov. 



Closely related to Cryptothrips Uzel (type C. lata Uzel, by 

 present designation), and no doubt derived from that section of 

 the genus which includes dentipes Reuter, bicolor Heeger, and 

 gih'ipes Hood. . The swollen head (which has suggested the 

 generic name), the reduced pterothorax, and the enlarged abdo- 

 men give the insect a truly ant-like appearance, and serve to dis- 

 tinguish it readily from described forms. 



(Edaleothrips hookeri sp. nov. (PI. 2, Figs. 1-3.) Female (apterous). 

 — Length about 2.6 mm. Head and thorax dark blackish brown ; abdomen 

 coal black, with first segment pale yellow and tube lemon yellow, tipped 

 with black, dorsum with three pairs of chalky-white dorso-lateral blotches, 

 on segments 2, 5, and 6, respectively, the blotches on i linear, the others 

 rounded, the pair on 5 largest; antennal segments i and 2 pale yellowish, 

 3 orange-brown in basal half, becoming blackish brown at apex, remainder 

 of antenna black. 



Head about 1.5 times as long as wide, elevated and swollen behind eyes, 

 narrowed posteriorly, and at base with neck-like constriction ; dorsal sur- 

 face rugose in the vertical region, reticulate posteriorly; vertex nearly 

 flat; postocular bristles small, almost lateral, capitate, similar to a for- 

 wardly-directed pair near base of antennae. Eyes flattened, protruding, 



