242 THIRTIETH REPOKT ON THE STATE MUSEUM. [130] 



XXVII. ON SOME SPECIES OF COSSUS. 



Cossus reticulatus n. sp. 



Allied to C.robinicB in shape of wings and markings, having 

 the stronger scales and reticulated ornamentation of that 

 species, in which it differs from the minute and -sparse scales 

 and transverse lines of C. querciperda and C. Centerensis. 



Primaries reticulated with black on a pale ash ground, the 

 wings lighter than n C. robinice, from the absence of the con- 

 spicuous intran^rvular black spots and streaks which charac- 

 terise that species, and are well represented in fig. 205, p. 413, 

 of Harris' Insects Injurious to Vegetation. In this species, only 

 between the internal, submedian and 1st median nervule 

 (veins la, Ib, and 2), at the outer third of the wing, do the 

 reticulations coalesce so as almost to form spots. In the ter- 

 minal and subterminal portions of the wing, the small ash 

 spots (sometimes ocellated with a black dot or line) for the 

 greater part rest upon the veins ; between 2 and 5, there are 

 other spots intermediate to these venular ones elsewhere, 

 with a few exceptions, the spots are venular, forming two in- 

 tranervular rows. The costal region is pale ash, traversed by 

 black lines rather than reticulated. The median portion of 

 the wing is imperfectly reticulated. The terminal margin, 

 and the unicolorous fringe is conspicuously marked with a 

 black spot on each vein. 



Secondaries thinly clothed with fuscous hairs, permitting 

 the reticulations of the lower surface to be seen in transpar- 

 ency, except between the margin and costal nerve, where it is 

 scaled in pale ash as the primaries. Terminal margin and the 

 pale fringe, black spotted as the primaries. 



Beneath : primaries much as above, with these differences : 

 There is an accumulation of blackish elongated scales in the 

 basilar region, in the interspaces of the internal, submedian 

 and median nerves ; also between veins 2 and 3 at their origin, 



