132 PROCEEDINGS OF THE NATIONAL MUSEUM. 



haiiy. Hind legs very slender, longer than abdomen; all femora and 

 fore tibiie brownish 3^ellow shaded darkest above; middle and bind 

 tibim and tarsi gray-brown to dark ))rown. 



Abdomen very small, but slightly longer than antennae and not as 

 broad as mesotho rax, narrowed' somewhat at attachment to thorax, 

 increasing gradually in breadth up to ninth segment; tenth segment 

 vervabruptly smaller and conical. Segment one very long and marked 

 by two brown, longitudinal carina dividing it into thirds dorsally. 

 Ninth segment also peculiar, ])eing very long and as broad as any in 

 thcal)donien; hind angles produced into a pair of claspers, also bearing 

 a pair of stout spines; tenth segment small and set with quite long, 

 stout spines. Second, third, and fourth segments nearly white, some- 

 times irregularly suffused with yellow; rest of abdomen tawny yellow. 



Described from three males. 



Cotype.—O^t. No. 6323, U.S.N.M. 



These males differ much more than is usual from the description of 

 the female but it seems that they are more closely allied structurally to 

 A. Ijicolor than to A. fasciatus, and so I place them with the former 

 species. 



Food plants. — Brunella vulgaris, Panicimi sanguinale^ bindweed, 

 and various grasses in mowings. 



Ilahltat. — Amherst, Massachusetts. 



Family THRIPID^. 



The members of this family have from six to eight segmented 

 antennae (apparentl}^ nine segmented in A?ia2?hothrlps striatus and 

 Pseudothrps iaequalls); the segments beyond the sixth are usually 

 short and form what is called the style. Maxillary palpi are usually 

 three, sometimes two segmented; labial palpi never composed of more 

 than two segments. The wings of Thripidse are usually slender, 

 gradually tapering more or less and pointed at the tips. The fore wings, 

 as a rule, present two parallel longitudinal veins, the front one run- 

 ning from the base to near the tip of the wing; the hind vein appears 

 usually as a branch from the fore vein at about one- third the length 

 of the wing. Sometimes, however, all connection between these vems 

 is wanting. Cross vems are rarely visible, though traces of them can 

 sometimes be seen. The ring vein is not usually very heavy or promi- 

 nent. A fringe is generally present upon the front margin of the fore 

 wing, but may be vestigial. More or less stout spines are found along 

 the veins and costa of the fore wing. The hind wing has one median, 

 longitudinal vem without spines and no cross or rmg veins, but the 

 costa bears a f rmge. The ovipositor of the female is bent downward, 

 i. e., concave side ventral. 



