32 MIMESEOPTILUS. 



with it. It differs from specimens which 1 have 

 seen from the Eastern States under the name of 

 tenuidactylus in its paler (more reddish-brown) 

 colouring, and in the somewhat duller whitish mark- 

 ings of the abdomen on the upper and underside, 

 but not in the blackish fringes of the anterior lobe 

 within the fissure. Yet in form and in the arrange- 

 ment of its markings it seems to agree precisely with 

 Mr. Asa Fitch's species, of which I saw specimens in 

 the Central-Park Museum at New York. It is open 

 to question how far these two forms may be entitled 

 to be considered distinct ; but I must leave it to be 

 decided by some one who has a more extended series 

 of the undoubted 0. tenuidactylus to refer to. 



Prof. Zeller gives Delaware as the habitat of 

 0. nigrociUatus. 



MIMESEOPTILUS, WaUengren. 



Mimeseoptilus exclamationis, sp. nov. 



(Plate II. Fig. 10.) 



Capite griseo ; paljpis supra griseis, utrinque et infra 

 hrunneis. 



Alis anticis griseis, apnd costam fusco atomosis, 

 pmictis (uno ante medium, duohus ante jissuram) 

 fuscis ; nota eJongata fusca supra Jissuram, in 



