172 THE ENTOMOLOGIST/"" 



Hind wings considerably reduce^ j,- 



Cross-vein between R 1 and lis in fore wing 

 striking the upper arm if 3+3 . of fork. Antennae 

 38- to 43-jointed . . .7-' . psociformis, Curt* 

 Cross-vein between R x and i?s**in fore wing 

 striking the stem Rs of for&. ^-ntennse 28- to 

 34-jointed ..... pineticola, End. 

 Both species are of similar habits. lam at present only able 

 to distinguish between the larvae by ttie fact that in C . psociformis 

 the antenna? are longer, as indeed might have been expected. 

 Tbe male genitalia appear to be the same in both species (Fig. 7). 

 Intermediate forms occur. I have two ? 2 and one $ from 

 Heston, 1921, which have 37-jointed antennae, and the cross-vein 

 between R x and Rs striking the latter at the fork point. These 

 were the only examples of ComcenTzia taken in this locality, and 

 evidently represent a distinct race. I have a similar but very 

 large and well-marked example from Epping Forest. In breeding 

 experiments I have not yet found a sufficient variation to indicate 

 that the two species psociformis and pineticola are not distinct. 

 It has been already mentioned that the Coniopterygidae are of 

 semi-colonial habits, and this remark applies especially to Con- 

 wentzia, in which colonies occur completely isolated from one 

 another when only a short distance actually separates them. 

 Possibly the two species under consideration may have been 

 isolated in this way. Under/these circumstances we must for 

 the present leave Conwentzia as comprising two forms which,, 

 within limits, breed true. 



Our British list therefore now comprises seven species : 

 Conwentzia psociformis, Curtis. 



,, pineticola, Enderlein. 



Coniopteryx tineiformis, Curtis. 



,, pygmaea, Enderlein. 



Semidalis aleurodiformis, Stephens, and its var. curtisiana, 



End. 

 Parasemidalis ? fuscipennis, Beuter, and annae, Enderlein.. 

 Helicoconis lutea, Wallengren. 

 The last species was discovered by J. W. H. Harrison in 1915, 

 and recorded in the ' Naturalist,' 1916. He rejected Enderlein's 

 generic name in favour of Aleuropteryx, Low. As I have very 

 little experience of this form, I have provisionally retained 

 Enderlein's genus, though it is very possibly, as Harrison says,, 

 a poor one. 



Walthamstow ; 

 July 1st, 1922. 



