the Lepidopterous Family Cossictae. 



161 



neuration in the fore-wing so different that at first sight 

 one would pronounce them distinctive of two separate 

 genera. In P. parvipuncta, Hmps., the structure of the 

 fore-wing is substantially the same as in Culama, but in 

 P. castaneae, Hb., the sector runs into the upper branch 

 of the median and the shape of the areole is distorted. 

 Although these two types of neuration seem so distinct, 

 some other species, such as P. impura, Hmps., present 

 intermediate forms, in which the anastomosis between 

 chorda and upper median is incomplete. The hind- wing 

 in this genus is similar to that of Culama, but is more 



Fig. 11. — Phragmatoecia 

 castaneae, Hb. 



Fig. 12. — Xyh utes crassa, Drury 

 (poliophijjn, Hmps.). 



primitive. In all the preceding figures the upper branch 

 of the median, which is the common stalk of veins 5 and 6, 

 terminates between those veins ; but the median cell has 

 been narrowed so that the lower branch, which is the 

 common stalk of veins 3 and 4, terminates either opposite 

 4 or between 4 and 5. Also veins 6 and 7 are separate 

 and parallel. For these reasons I am unable to regard 

 Phragmatoecia as a direct derivative of ('ultima; but un- 

 doubtedly Phragmatoecia is derived from the stem from 

 which Culama arose. The former genus is in other respects 

 less primitive than the latter; it has the antennae shortly 

 pectinated nearly to the apex in both sexes, but in the <$ 

 the pectinations are long for the basal § and then become 



TRANS. ENT. SOC. LOND. 1918. — PARTS I, II. (DEC.) M 



