916 



THANAOS. By Dr. M. Draijdt. 



margiii somewhat angular, the fringed posterior tibiae exhibit 2 pair of spurs. Numerous species of a very dark 

 colouring in contrast with the preceding genus, the principal range of which is situate in North America. 



brizo. Th. brizo Bsd. <h Lee. (178 f). Above lilac-grey with darker macular bands, the postdiscal band very 



regularly formed of small ring-spots, appearing also beneath as minute light yellow spots. Hindwing with 

 a row of yellowish submarginal dots being more distinct beneath. Atlantic States, Colorado, Arizona. The 

 larva lives on oaks, Galactia and Baptisia. 



icehis. Th. icelus Lintn. (178 g) is much smaller, the postdiscal area much lighter than the rest of the wing; 



the yelloAvish dots above and beneath do not form any regular rows, but are more dispersed. The range is the 

 same. The larva lives on foliage-trees. 



Th. somnus Lintn. 

 marginal row of light dots 



(178 g) is somewhat larger than icete and a verj' dark species so that only the sub- 

 is more distinct. From Florida. 



luciliits. Th. lucilius Lintn. (178 g) is a smaller, very common species, blackish-brown with darker macular 



bands and minute light submarginal spots; discernible from the very closely allied pacuvius (178 h) by its lighter, 

 dark-marked hindwing with a submargmal band of light spots, in which near the apes 2 spots are far removed 

 towards the base. The likewise very closely allied zirucco has much more intense purple-grey dusting on 

 liliiis. the wings and more regular macular bands on the forewing. Atlantic States. — f. lilius Dyar is very similar, 

 larger, as large as zarucco, more mixed with brown, particularly a brown spot at the cell-end is very prominent, 

 being interrupted by the straight, dark cell-end line. The markings are more bhu'red and not so much con- 

 trasting as in zarucco. A geographical race from British Columbia, Washington, California. Flies in Maj', June, 

 and again in August. 



persiiis. Th. persius Scddr. (178 g) is much more monotonous and mostly darker than lucilius, but very 



variable in this respect. Apex of forewing a little more pointed than usually with 3 distinctly prominent, small 

 subapical spots. The hindwing scarcely shows traces of the light submarginal dots. Atlantic States and Rocky 

 Mountains. Larva on willows. 



ausonius. Th. ausonius Lintn. is the smallest of all the Thanaos-s^eciefi; by the absence of the white subapical 



spots it approximates hrizo, otherwise it is more closely allied to zarucco. The submarginal band composed 

 of small, oblong, black spots is twice very much bent. The transverse vein is conspicuously marked brown.. 

 Instead of the discal band being coherent in the other species there are here 3 small, oblong, blackish-brown 

 diffuse spots. The species was established according to a single ^ from Center (Colorado) that was taken on 

 May 12th 1871. 



afrmiius. Th. afratlius Lintn. (178 g) is a very small species with a blackish-brown, grey-marbled forewing 



showing 4 small, oblique subapical dots and one behind the cell. Hind\Ning dark blacldsh-brown with a double 

 row of small submarginal dots being above very indistinct, beneath more prominent. Colorado, Arizona. 



zarucco. Th. zarucco Luc. (= martialis Scddr.) (178 g) very much resembles lucilius, but it is much more dusted 



with a purple or lilac-grej', and thereby lighter, and the macular bands are more regularly arranged. The sub- 

 margmal spots on the hindwing are more kregular and more blurred. Atlantic States, Colorado, also in Cuba. 

 The larva lives on Indigofera and Amaranthus. 



■jurenaUs. TH. juvenaHs F. (= juvenis Hb7i., costalis Dbl. d: Hew., ennius Scddr., concolor H.-Schdff.) (178 g). 



A miich larger species, light brown, marbled by black macular bands and with a complete, postdiscal row of 

 small hyaline spots bordered by small black sagittiform spots ; also at the cell-end there are two. Atlantic States 

 and Rocky Mountains as far as Missouri and New Mexico. The larva lives very polyphagous on oaks and Papi- 

 lionaceae. 



peirotrixis. Th. petronius Lintn. (178 g) is similar, especialljr in the basal half darker, more contrasting: the band 



of hj^aline spots does not extend so far to the proximal margin. The hindwings are also much darker. Florida. 



homtius. Th. horatius Scddr. (= virgilius Scddr.) (178 h). Marked as juvenalis and with the same band of hyaline 



spots, but onljr half its size, and of a very much lighter ground-colour. From the southern Atlantic States. 



ierenlius. Th. terentius Scddr. (= ovidius Scddr.). Of this species we find in the literatiu'e accessible to us 



only a verj- detailed description of the q genital armatiu-e, and for this reason we cannot make anj' particular 

 statements as to its exterior. It originates from Florida. 



propcriius. Th. propertius Lintn. (178 h) is likewise somewhat smaller than juvenalis, very much lilie it, darker, 



greyer, more monotonous, the small postdiscal hyaline spots verj- small. Owing to the distal margin running 

 somewhat more obliqueh^, the course of the band is more oblique, too. Hindwings darker. Pacific States. 



