228 ENTOMOLOGICAL NF.\YS. [May, '09 



those on the abdomen, slightly enlarged at the tip. Mesothorax with 

 rather prominent anterior angles, which are nearly right-angled. Wings 

 wanting. Legs short, dark brown to black, except the tarsi which are 

 brown ; all tarsi armed with fairly prominent curved teeth. Spines on 

 legs short and comparatively few in number, being most numerous on 

 convex sides of femora. 



Abdomen stout, broadly rounding from seventh segment to the tube. 

 The third to eighth segments inclusive bear five or six spines on each 

 side, forming a row extending well on to both dorsal and ventral surfaces. 

 Nearly all abdominal spines enlarged at tip, except on the tube and some 

 on the ninth segment. Color black, except tip of tube which is brown. 



Described from five females taken among the leaves of the 

 pine-cone gall on the willow, Salix fluviatilis, July 14, 1908. 

 The salient features of this species, one or another of which 

 readily distinguishes it from the majority of the other mem- 

 bers of the genus, are the absence of wings, the color of the 

 antennae, the paucity of conspicuous spines on the prothorax, 

 and the fact that all the tarsi are armed. 



Genus ALLOTHRIPS Hood (1908). 



Allothrips megacephalus Hood. 



Male. Newly discovered. Agrees well with the female, except in 

 size, shape of abdomen, and in the fact that the fore tarsi are armed with 

 a small curved tooth. Length of body .81 mm. ; width of prothorax .21 

 mm.; width of mesothorax .21 mm.; width of abdomen .25 mm. Abdo- 

 men tapering gradually from third or fourth segment to the tube, not 

 broadly rounded as in the female. 



A single specimen taken with three females under the scales 

 of bark of black ash, Fraxinus nigra, August 24, 1908. 

 Both antennae lost beyond second segment. The definition of 

 the genus will have to be emended by omitting the character 

 " fore tarsi unarmed." 



On Thysanoptera. 

 BY H. J. FRANKLIN, PH.D. 



Of the Minnesota Agricultural Experiment Station, St. Anthony Park, Minn. 



ALEDRODOTHRIPS n. gen. 



This name "White fly thrips" has reference to the fact that 

 the type species is predaceous on the white flies of orange 

 trees in Florida. 



Head about as long as broad, with parallel cheeks ; eyes 



