210 ZYGiENID^ AND BOMBYCIDiE 



9 -ALYPIA LANGTONII. (PI. 8, fig. 3, $ .)* 



Alyptia Langtonit, Couper. 



Alypia odomaculata, (part) Walker, Cat. Lep. B. M. I. 6o. (1854.) 



$ . — Black and sulphur yellow. Head and front black ; sides of 

 front next the eyes and sides of head behind the eyes narrowly yellow. 

 Palpi black, yellow inside, and at the base beneath. Antennae black, 

 basal half sub-annulate with yellow. Thorax and abdomen black, 

 both above and below. Prothorax black. Patagia sulphur yellow. 

 Legs black, with a few minute white markings on tarsi. Tibiae of the 

 two anterior pair clothed with orange scales. 



Wings dull black with a few metallic blue scales centrally on the 

 superiors. Anterior wings with two unequal sulphur yellow spots. 

 The smaller, longitudinal, oval, subbasal ; the larger, transverse, sub- 

 ovate, placed at right angles to the costa across the base of the nervules. 



Secondaries with one rounded spot, intermediate in size between the 

 two on the primaries, placed on the discal vein. 



Beneath as above, except that the black of the wings is less intense. 



Expanse of wings, i.io inches ; length 0/ body, 0.50 inch. 



Habitat. — Canada, (Couper). New York, Pennsylvania, (Grote). 



Walker considered this species as a variety of ^. odomaculata, a con- 

 clusion in which he can hardly be sustained. Evidently its nearest 

 ally is A. Sacramenti of California, which has precisely the same num- 

 ber of spots. The latter is, however, a much larger insect, so far as 

 I can judge from the three examples which I have seen. In the col- 

 oration of the body parts it is almost identical, and the most constant 

 and recognizable difference is to be found in the spot on the under sur- 

 face of the secondaries, which in A. Langtonii shows no tendency to 

 the expansion noticeable in A. Sacramenti. The habits of the latter 

 species are also peculiar as noted ; there seems to be no record of a 

 similar peculiarity with regard to A. Langtonii, which would scarcely 

 have escaped notice had it been a prominent character. In my speci- 

 men of A. Sacramenti, the legs are imperfect, but I note that while 

 the tibae of the middle pair are orange, they do not have a clothing of 

 long hairs. 



*See page 5, ante. 



