327 



tinged with yellow ; the stigma and nervures brown. Expands nearly five 

 inches. 



Front vesicular, pale brown, lip above base of the mandibles, two trans- 

 verse narrow lines above the lip, and two small spots before the antenna?, 

 blue green. Eyes blue green above, with a large indigo blue patch, before, 

 pale and clear ochre brown below. Thorax brown; with two longitudinal 

 stripes before, and two oblique ones on each side, a spot between the latter 

 near the wings, two small spots at the articulation of each wing, and the 

 scutellar portions blue green. Abdomen brown, with a lateral longitudinal 

 line on each side, and two narrow bands near the base, and one near the tip 

 of each segment, blue green, except the first segment, which has only a 

 short terminal band, and the last three segments, the last of which is 

 immaculate, and the two preceding each with a subterminal band, inter- 

 rupted in the middle so as to form two transverse spots. Anal folioles deep 

 chestnut brown. Legs black. $ with the upper anal folioles tricarinate, 

 narrowed at base, and fringed with hairs on the inside; lower appendage 

 half as long as the folioles, flattened above and truncated at tip. $ with 

 the anal folioles shorter, lance oval, flat and not hairy. Ovipositor cultri- 

 form, with palpiform appendages on each side. 



Taken from living specimens, June 10-20, 1839. 



PSOCUS i Latr. 



* 



. 



This genus is allied to Sialis in form and disposition of its wings. The 

 genus Aphis is its representative among the Hemiptera, to which it has a 

 very remarkable resemblance in general form and appearance, but with an 

 entirely different oral apparatus. The insects of this genus assemble at 

 certain seasons in swarms about old fences, buildings and trees, particularly 

 such as are decayed or affected with dry rot. The larva? probably live in 

 these places gnawing the wood. The definition of the antenna? in Coque- 

 bert is incorrect, for in Psocus the antenna? arc eleven jointed, the first 

 joint thickest, short, conical; second shortest, turbinated or obconical. not 

 longer than thick; third and remaining joints nearly cylindrical or seta- 

 ceous, very long and slender, and with articulations which are easily seen 

 with a good glass, and which become gradually shorter towards the tip, the 

 third being the longest of all. 



i Latreill-J was not always correct in the formation of new terms ; according to the 

 etymology, the name of this genus should be written Psochta. 



