New Species of Scale Insects. 398 



more abundant than the true imago. The wingless form 

 is very active, and runs with considerable freedom. I 

 have repeatedly seen it copulating. The winged form is 

 also very active, but is rarelj' seen. Gossyparia ulmi 

 Geof., another coccid injurious to elm, is also peculiar 

 in having two forms of males.* 



1 have bred two species of hymenopterous parasites, 

 Perissojpterus pulchellus (Howard) and Physcus varicomis 

 (Howard), from this "American elm scale." I have also 

 reared specimens of a parasite, presumably different from 

 the above, but they were so badly damaged by accident 

 that it was found impossible to determine them. Under 

 some scales I have seen a very small mite among the 

 eggs, and I have seen both the larva and adult of the 

 twice- stabbed ladybug, Chilocorus hivulnerus, feeding 

 upon this scale. So far as my observations go, the 

 parasitic and predaceous enemies of this insect are to 

 be considered as very trivial agencies in keeping the 

 species in check. 



♦Insect Life, VoL 11. , p. 37. 



