to Mr. Theo. Pergande, one of the highest authorities on this 

 group of insects, who expressed the opinion that the specimens were 

 identical with Thrips striata Osb., and placed them in the genus 

 Anaphothrips Uzel. This is the only known genus in which some 

 of the species have a distinct oblique suture near the end of the 

 sixth antennal segment. I have made a critical study of the genera 

 in Uzel's " Monographic der Ordnung Thysanoptera," and agree 

 with Mr. Pergande that this insect should be placed in the genus 

 Anaphothrips, which is characterized as follows : — 



Genus ANAPHOTHRIPS Uzel, Mon. der Ordnung Thys., 

 page 143 (1895). 



Ocelli present, body furnished only with short hairs ; but there 

 are no long bristles at the end of the abdomen and the hind angles 

 of the prothorax. The antenna has eight segments, both segments 

 of the stylus being moderately long. The species virgo has the 

 sixth segment of the antenna broken near the end by an oblique 

 suture, so that the antenna appears to have nine segments. Max- 

 illary palpi with three segments. Prothorax about as long as the 

 head. Legs unarmed. Wings generally present, but the species 

 virgo is generally wingless. The cilia in the fringe of the costa 

 of the fore wing are exceedingly short. The bristles on the veins 

 are fine, and generally very short and inconspicuous. The bristles 

 at the end of the abdomen are also very short and fine ; but in 

 virgo and sordida the bristles on the end of the ninth abdominal 

 segment are short and stout. The males generally have two pairs 

 of very short, stout spines on the upper side of the ninth abdominal 

 segment, the anterior pair being much larger than the posterior. 

 The species belonging here have no power to leap. 



For the purpose of making a comparative study of the material 

 before me with the types of Professors Comstock and Osborn, 

 Professor Fernald obtained the loan of these types, and I find 

 upon making the comparison ihvii Limothrips poaphagus Qom%t., 

 Thrips striata Osb., and the species which I have found in such 

 abundance here in Amherst and upon which I have made the 

 studies given in this paper, are identical ; and, as the species was 

 first described by Osborn, his name should hold, and this insect 

 be known by the scientific name of Anaphothrips striata (Osb.). 



Since Professor Comstock's first mention of the injury done by 

 this species of thrips to June grass and timothy, several economic 

 entomologists have referred to the most conspicuous efifects of its 

 work, the dead tops of these grasses, as " silver-top" or " white- 

 top." Many have questioned the agency of thrips in producing 

 this injury, and have ascribed it to some other suctorial insect ; 



