WM. G. DIETZ, M.D. 21 



slightly curved outward at dorsal margin, and heavily shaded exter- 

 nally with dark brown, first discal large about middle of wing length, 

 two spots at end of cell, almost obscured by a slightly oblique, straight 

 fascia, middle and apical spaces more or less suffused with brown ; a 

 rather dense sprinkling of white scales before the fascia at end of cell, 

 more especially in dorsal portion, some similar scales in apical third. 

 Cilia gray, with about four pale lines sprinkled with white and brown 

 scales near base. Hindwings pale gray, dusted with fuscous ; cilia 

 over 2, gray, tinged with ochreous towards the base. Abdomen 

 grayish-fuscous ; anal bush grayish-ochreous. Underside of body 

 grayish-white, with silvery lustre. Legs ochreous-white ; tarsi, espe- 

 cially posterior, fuscous externally, apices of joints paler. Rough hairs 

 of posterior tibia? pale ochreous. Expanse 8.5 mm., 0'34 inch. 



Hub. — Washington, D. C. A unique male specimen col- 

 lected by Mr. A. Busck, June, 1902. 



CALOSIMA gen. n. 

 Type argyrospiendella. 



This genus differs from Holcocera in the presence of a con- 

 chiloidal shield of close set scales, on the basal joint of the 

 antennae instead of a pecten and the absence of discal spots 

 or other markings of the forewings. 



The head is rather small and depressed, the face strongly 

 receding, giving thus the thorax a somewhat more convex 

 appearance as is usual in this group. The palpi are long, 

 slender and recurved, the second joint scarcely thickened 

 towards the apex. The antennas are not excised above the 

 basal joint in the male. Forewings more of less elongate, 

 acutely pointed ; 12 veins, 7 + 8 stemmed, 7 to costa. Hind- 

 wings 8 veins, 3 + 4 connate or short stemmed, 5 connate 

 with the stem. 



In appearance the two species here described have rather 

 an CEcophorid habitus than that of a Blastobasid. The vena- 

 tion, however, admits of no doubt. This genus holds the 

 same relationship to Holcocera as Zenodochium holds to Blasto- 

 basis. 



The two species, though closely allied, may readily be 

 distinguished as follows : 



Larger, extreme costa pale, hindwings obtusely pointed clianella. 



Smaller, extreme costa dark brown, hindwings acutely pointed. 



argyrospiendella. 



TRANS. AM. ENT. SOC, XXXVI. FEBRUARY, 1910. 



