OF WASHINGTON, VOLUME XIII, }<>\\. ( ) 



specimens are received from thfs region, which accounts for 

 the paucity of our knowledge of this form. It may be, and 

 probably is, locally abundant. 



Hemileuca marillia, new species. 



Rosy brown to dull rone-color. Thorax rosy brown with whitish 

 overcast. Fore wing with the costa more or less marked with whitish, 

 but no ocherou.s; lines broad, distinct, whitish; discal mark narrow, 

 whitish, obscure. Hind wing rosy brownish in both sexes, with an 

 outer whitish diffused line. Beneath the lines faintly reproduced, the 

 basal part of the fore wing red. Abdomen dark rose-rod. Expanse: 

 Male 50 mm.; female 60 mm. 



Two males, two females, Tehuacan, State of Puebla. Mex- 

 ico (R. Miiller, No. 1753;. 



Type: No. 12932, L". S. National Museum. 



This is closely allied to the following species, and may 

 prove to be not specifically distinct therefrom. The present 

 species comes from the southern end of the Mexican plateau, 

 whereas Lex has been found some (>W) miles farther north. 

 Specimens from intermediate points are needed to show the 

 relationship of these forms. 



Hemileuca lex Druce. 



Euleucoph&us le.r Druce, Biol. Cent. -Am., Lep. Het., II, 42n, 



1897. 



Described from a single male from Durango City at the 

 foot of the Sierra Madre. The species is not before me, but it 

 is interesting to note the similarity in location with that of 

 the allied oliiicr. 'Both species inhabit high, arid land on the 

 eastern slope of a mountain range. 



. Of the above twelve nominal species not including the 

 aberrant dukinficldi Schaus; , eight are from the Mexican 

 plateau ('two without exact localities), six (two doubtful; 

 from the lower and best known part of that region, two from 

 the central portion in State of Durango. Of the outlying 

 forms, one is known from the peninsula of Lower California, 

 one from southwestern Arizona, and one from New Mexico, 

 while but a single species occurs outside of the high arid 

 regions, namely, mcDiia Druce, from the State of Yera Crux. 

 In the center of distribution several species may occur in the 

 same general region, whether actually associated or not is not 

 known; but in the outlying portions of the general area of 

 distribution the species occur singly. Kvidently the ancestor 

 of these species was an inhabitant of the Mexican plateau, 

 where the larva.- fed upon grass in the absence, practically, of 



