ORTALID^ — PYRGOTA. 81 



corresponds to the entirely discolored spots in P. undata, are 

 hyaline. These two streaks have a very definite outline, and the 

 space beyond them is as dark-brown as the remainder of the 

 wing ; the longer one is almost straight, the shorter one sickle- 

 shaped. The halteres are pale ferruginous-yellow. 



JHab. Carolina (Zimmerman). 



Observation.— The above description is the reproduction of 

 that prepared by Dr. Gerstaecker, 1. c, from a single specimen 

 in the Berlin Museum. I have had a passing view of the speci- 

 men ; it is very like P. undata. The differences in coloring, 

 noticed by this author, are in myopinion of but little importance, 

 as most of them occur among the varieties of the very variable 

 P. undata. More important are the plastic differences, mentioned 

 by Dr. Gerstaecker. Although the shape of the head in different 

 specimens of P. undata is variable (evidently, however, in con- 

 sequence of different degrees of shrinkage in drying), although 

 the size of the third antennal joint is subject to slight variations, 

 and although the relative length of the first two joints of the arista 

 is not altogether constant, it is hardly credible that all these dis- 

 crepancies should reach the degree which Dr. Gerstsecker noticed 

 in his P. vespertilio. 



4. P. pterophorina Gerst. 9 .— -Antennarum articulo tertio pne- 

 cedente paulo longiore, oblongo ovato, arista brevissima, crassa : fronte 

 oculis latiore, fortiter prolongate, palpis cochlearibus ; alis latis, vena 

 longitudinal! secunda geniculate, nee appendicular, fuscis; alula, 

 maculis duabus, posticis magnis, semilunaribus, guttisque duabus 

 hyalinis. 



The third antennal joint is somewhat longer than the preceding one, 

 elongated-oval, with a very short, stout arista ; front broader than the 

 eyes, very much prolonged; palpi spoon-shaped ; wings broad, with a 

 second longitudinal vein which is geniculate, but has no stump of a vein 

 upon it ; coloring on the wings brown ; alula, two large crescent shaped 

 spaces on the posterior margin and two dots hyaline. Long. corp. 0.4 ; 

 long. al. 0.44. 



Syk. Pyrgota pterophorina Gerst., Stett. Entom. Zeit. xxi, p. 190, Tab. II, 

 f. 6. 



Body small, slender, pale-ferruginous, shining. Head, viewed 



from above, by one-third longer than broad; front broader than 



the eyes, but, taken as far as the anterior margin of the eyes, 



nevertheless longer than broad ; the gibbosity only a little shorter 



6 



