39 



that species. It may on further study prove to have some connection 

 with the one now being discussed, though I have not found it attack- 

 ing rye. 



FITCH'S ISOSOMA. 



{Isosoma fitcMi Howard. ) 



This is the last of the described Isosomas known to attack growing 

 grain, though 1 have reared what appears to be still another from 

 wheat straws from Carbondale, 111.; but the specimens are still 

 undetermined and nothing definite can now be said of them. This 

 species was described from 2 females and 1 male found iu'the Fitch 

 collection, labeled in Fitch's handwriting, ^^Eurytonia 7</r/Y/(^/ Harris, 

 Nos. 15223 and 15197." Nothing whatever is known of its habits, 

 but it was presumably reared, with some other species, from grain. 



DESCRIPTION. 



^'Female. — Length, 3 mm.; expanse, 5.8 mm. Head, pronotum, and mesonotum 

 faintly shagreened, nearly smooth, shining; mesoscutellum with a few sparse punc- 

 tures; metanotum with a complete median longitudinal furrow emarginate on the 

 anterior half and with a central carina extending nearly to tip; very coarsely rugu- 

 lose either side of the furrow with a faint granulation between raised lines; pronotal 

 spot large, plainly seen from above, and two spots together occupying about one- 

 third of the dorsal aspect of the foreborder of the pronotum. Antennae with well- 

 separated joints; funicle joints 2, 8, 4, and 5 equal in length and width; joint 1 a 

 little longer; joint 5 as well separated from the club as from i)re{;eding joint; club a 

 little longer than 4 and 5 together, but of the same width. Abdomen as long as the 

 thorax; joint 4 shorter than 6; 5 longer than 6; 7 and 8 subequal. Color l)lack, 

 except for pronotal spot and knees, which are luteous; claw of stigmal (ilub given off 

 about at tip of club, straight. 



"Male. — Length, 2.2 mm.; expanse, 4.2 mm. Petiole about as long as hind coxse 

 and nearly equal in length to first abdominal segment. Antenna; with funicle joints 

 very shghtly arched above, each joint fully three times as long as wide, and slightly 

 constricted in the middle; otherwise as with I. honlei." (Howard, Tech. Ser. 2, 

 Div. Ent., U. S. Dept. Agr., p. 20, 1896.) 



I have now treated all of the species of these insects known to attack 

 cultivated grains in this country, though there may be still others as 

 yet unknown. These known species have been described in each case, 

 not especially for the benefit of the unentomological farmer but because 

 this publication will go to many lands and into the hands of many dif- 

 ferent peoples. Some will care nothing for descriptive matter, and 

 such can easily pass over it in the use of this bulletin, but there will 

 be others who will look to its pages for aid in determining with exact- 

 ness the identity of the species which they may have before them, and 

 for these descriptions are a necessity. Some of the species included 

 may appear to be of no especial interest to the practical farmer, but 

 of this no one can confidently predict. It may be true to-day and not 



