110 JOHN B. SMITH. 



The type of Lepisesia is the New England flavofasciata, a rarity, 

 diifering in the somewhat stouter, shorter, more or less depressed 

 body from the others. Tlie wings have a semi-transparent fascia, 

 which is yellow on the secondaries. The palpi are short, the front 

 wide, and the secondaries nari'ow, the anal angle not produced. Its 

 n'ear ally, so far as the figure and description will admit of judgment, 

 is Macroglosm idalume .Strk., which, besides some minor difi'erences, 

 has the semi-transparent fascia blackish and not yellow^ on the secon- 

 daries. 



The type of Euproserpinus is the Californian s])ecies E. phieton 

 G. & R., a shorter winged species, with more slender, scarcely de- 

 pressed form, thin vestiture, and with the secondaries broader and 

 somewhat produced anally, not, however, acutely so. The disc of 

 secondaries is very pale whitish yellow. Close to this in structure 

 of head, short palpi and thin vestiture is Pogocolon darkice Bd. 

 This has the typical ornamentation of Pogocolon — more or less olive 

 green in color with a deeper central band — and the peculiar western 

 shagginess so marked in some of the species of Hemaris. The sec- 

 ondaries have the anal angle scarcely marked. Intermediate be- 

 tween this and gaiuxe is P. circece Hy. Edwards, an Eastern form 

 resembling clarkue somewhat in wing form, but with the anal angle 

 of secondaries much more distinct, larger also in size and with more 

 dense vestiture, the palpi longer and more distinct. 



At the extreme comes P. gaune with its Yariety jiianita 8trecker, 

 differing from all the others in its larger size, acutely produced anal 

 angle of secondaries and more prominent palpi, the latter forming a 

 short pointed snout similar to that in some sjiecies of Hemark. The 

 vestitui'e is longer, thicker, more smoothly appressed and the habitus 

 of the insect most nearly approaches that of Deileplilla. 



Of the species the genitalia of clarkke alone have been examined, 

 and they have presented nothing of special note. They w'ill be de- 

 scribed under that species. In tabular form the scheme above de- 

 veloped would be as follows : 



Primaries with a semi -diaphanous fascia. 



Secondaries with a yellow fascia flavolaseiata. 



Secondaries with fascia semi-diaphanous, blackish as on primaries .ulalliliie. 

 Primaries without semi-diaphanous fascia. 



Secondaries with disc very pale yellow l>lia?toii. 



Secondaries orange or red. 



Vestiture thin, palpi short, size small. clarkia?. 



Vestiture thicker, palpi longer, size larger circese. 



Vestiture smooth, dense ; palpi forming a short snout ; size larger..gaura?. 



