1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 189 



have seen nothing like real intergrades. The larval history, which 

 might serve as a guide, is unknown as yet. 



According to Belfrage, as quoted by Stretch, the insects fly in May 

 and June. They are generally distributed through the State of Texas, 

 though nowhere common ; are generally taken on the wing in the day- 

 time and are also attracted to light at night, 



In the Museum collection we have eighteen specimens, about equally 

 divided between the two forms, and ranging in dates of capture from 

 the middle of March to the end of May. One specimen is dated Au- 

 gust, which appears to indicate two broods. 



Cerathosia Smith. Eutoni. Amer., 1887, vol. 3, p. 79. 



Body slender, graceful, untufted. Head distinct, rather prominent; 

 palpi slight, reaching the middle of the front, the terminal joint minute. 

 Tongue moderate in length. Eyes hemispherical, prominent; ocelli 

 distiuct. Antennae simple in both sexes. Front depressed, excavated, 

 with a circular, sharp, somewhat irregular rim ; in the center of the de- 

 pression is a cylindrical projection with a truncate and somewhat cup- 

 shaped tip. Thorax ovate, with smooth, scaly vestiture. Abdomen 

 elongate, slender, cylindric, smooth. Legs slender, smoothly sealed, 

 increasing in length posteriorly. Anterior tibia shortest, rather stout, 

 with a moderately long, curved spine 

 at tip ; middle tibia with one pair, 

 posterior with two pairs of spurs, 

 not spimilose. 



Primaries narrow, elongate, sub- 

 equal, outer margin slightly oblique, 

 arquate ; 12- veined ; accessory cell 

 present; internal vein not furcate 

 at base ; veins 3, 4, and 5 nearly 

 equidistant from the end of the me- 

 dian; 6 from lower margin of acces- 

 sory cell ; 7, 8, aud 9 on a short stalk 

 from the end of accessory cell, 8 to 



the apex, giving off 9 at about its middle ; 10 from upper angle of ac- 

 cessory cell. 



Secondaries large, rounded. Two internal veins; 2 from median at 

 its outer third ; 3 and 4 on a short stalk from the end of the median : ."> 

 very weak, midway between 4 and C ; 6 and 7 from a short stalk at end 

 of subcostal; the costal (vein 8) from the subcostal about two-fifths 

 from base. 



Supra anal plate of $ triangular; hook somewhat irregular, thickened 



*The figure is incorrect in not showing vein 5 of secondaries; the vein is midway 

 het ween 4 and G, and is very weak — so weak as to lie invisible in the recent mount 

 in Canada Balsam, aud in the best instance almost obsolete. The drawing was made 

 from two slides newly mounted. 



Venation and fore leu of Cerathosia.' 



