1912.] 43 



had only beeu taken from August to Octobex\ The imago, in both 

 sexes, flies fi-eely and briskly on favourable evenings, especially to- 

 wards dusk, and on October 10th, 1906, I netted one, on the wing of 

 its own accord, as early as 4.40 p.m. It certainly has a " sweet tooth," 

 as is shown by the fact that it has come to my "sugar" on several 

 occasions in the months of August, September, and October ; it is also 

 attracted by artificial light, which yielded Lord Walsingham seven 

 specimens on the Lido, near Venice, during May, 1910. 



It has often beeu questioned whether M. crocicapitella, Clms., is 

 truly distinct from ferniginella HI)., but there is no longer any room 

 for doubt in the matter, for the male genitalia furnish proof that the 

 former is not conspecific with the latter. The accompanying Plate 

 shows these appendages in the two species under notice, and also in 

 two of their congeners. The preparations, from which the photo- 

 graphs were taken, are due to the skill of Dr. T. A. Chapman, to 

 whom I am also greatly indebted for the following interesting notes. 



Comparison of male genitalia of Monopis ferruginella, Hb., imella, 

 Hb., crocicapitella, Clms., and monachella, Hb. : — 



"All these differ from the group of M. rusticella, Hb., loeaverella, 

 Scott, imd Tinea pallescentella, Stt.,witli theu* oval clasps with rounded 

 ends, in having comparatively straight ends with shai-p angles, most 

 marked in crocicapitella and monachella. In the two latter, in fact, the 

 clasp might almost be descrilied as quadrangular with straight parallel 

 sides and a straight end at an angle to the sides of about 70°. Imella and 

 ferruginella are a little more rounded. The tedeagus is very short and 

 broad in imella, longer and narrower in monachella, still narj'ower in 

 ferruginella and crocicapitella. (In the specimen the sedeagus and 

 saccus have both been accidentally cut across, the gap is due to the 

 portions being separated, not to any portion being wanting) . The 

 saccus is short in imella, very slender in crocicapitella, slender and 

 thickened towards the end in monachella. The double scaphium has 

 thick curved and clubbed ends in crocicapitella and imella, straighter, 

 slighter, and more pointed ones mferruginella and monachella. There 

 are minor points of difference, but these are sufficient to illustrate how 

 different specifically the four forms are." 



I may mention in conclusion, that the genitalia of both sexes of 

 Monopis rusticella, Hb., and weaverella, Scott, were shown on the plate 

 (PI. V) issued with the October (1910) no. of this magazine. 



Meyrick [HB. Br. Lep., 784-785 (1895)] includes five British 

 species in the genus Monopis. One of these, viz., fenestratella, Heyd., 



D 2 



