CLEAR-WING MOTHS OF FAMILY AEGERIIDAE 139 



fereiices are the more elongated harpe and ihe deeper excavation below 

 the aedeagus hook in iahaniformis against the shorter harpe and shal- 

 lower excavation below the aedeagus hook in triciiicta. Nevertheless the 

 Old and New World species are so closely related as to form a natural 

 biological group with similar food plants and habits and a Holarctic 

 distribution. 



Beutemniiller's "Monograph of the North American Sesiidae" (Mem. 

 Amer. Mus. Nat. Hist., vol. 1. pt. 6. pi. 33. fig. 9. 1901). well illustrates a 

 typical example of the female of triciiicta. The sexes are easily separated 

 by the heavily bipectinated antennae and the yellow banding of abdominal 

 segments 2, 4. 6, and 7 in the male ; the female has simple antennae, and 

 only abdominal segments 2, 4, and 6 are banded with yellow. 



Distribution records for specimens in the United States National 

 Museum: Toronto, Ontario; Long Island, N. Y., Plainfield, N. J.; Vir- 

 ginia ; Bufifalo, N. Y. ; Montana ; Colorado. 



PARANTHRENE TRICINCTA form DENOTATA (Hy. Edwards) 



Albima denotata Hy. Edwards, Papilio, vol. 2, p. 55, 1882. 



Sciapteron denotata Beutenmuller, Bull. Amer. Mus. Nat. Hist., vol. 4, p. 171, 1892; 



vol. 5, p. 24, 1893 ; vol. 8, p. 119, 1896. 

 Memylhrus denotatiis Beutenmuller, Mem. Amer. Mus. Nat. Hist., vol. 1, pt. 6, 



p. 248, pi. 30, fig. 1 (female), 1901. 

 Paranthrene denotata McDunnough, Check list of tlie Lepidoptera of Canada and 



the United States of America, pt. 2, No. 8793, 1939. 



Male. — Forewing rusty dark bro^^•n, edged with reddish orange on costa 

 and inner margin. Abdomen with segments 2, 4, 6, and 7 conspicuously 

 banded with yellow and segments 3 and 5 narrowly edged with yellow ; 

 anal tuft black and yellow mixed. Otherwise like typical male of tricincta. 



Female. — Like the male, but conspicuously banded with yellow only on 

 abdominal segments 2, 4, and 6 and with faint indications of yellow bands 

 on segments 3 and 5. 



Distribution. — Rocky Mountain regions, Colorado to Montana; Alaska. 



Type. — Male. In the American Museum of Natural History. 



Remarks. — The form denotata can be considered only as a transition 

 color phase connecting tricincta with the extreme color form "oslari," 

 hereafter described. It is found in mixed colonies in the Rocky Mountain 

 regions of Colorado and Montana, and one male is recorded from Fort 

 Yukon, Alaska. I question the accuracy of Beutenmiiller's figure (loc. 

 cit., pi. 30, fig. 1) illustrating a female with abdominal segments 2. 3, 4, 

 6, and 7 broadly banded with yellow. All the many female examples 

 examined are conspicuously banded with yellow only on .segments 2, 4, 

 and 6, with a few scattered yellow scales on 3 and 5. 



Records in the United States National Museum : Denver, Colo., males 

 and females (Oslar) ; Williston, Williams County, N. Dak., male, June 

 9, 1923 (H. Notman) ; Montana^ female; Fort Yukon, Alaska, male. 



