AX ATOMY AND PHYSIOLOGY 



117 



FIG. 186. Hermaphrodite gypsy moth, 

 Port heir ia d is par; right side, male; left, 

 female. Natural size.^After TASCHENBERG 

 from Hertwig's Lclirhiu'lt. 



Cynipidae. In some Cynipidae, however, males are unknown; such is 

 the case also in some Tenthredinidae. The statement has long been made 

 that the unfertilized eggs of worker ants, bees and wasps produce invari- 

 ably males; it has been found, however, that the parthenogenetic 

 worker eggs of the ant La- 

 sins nigcr may produce normal 

 workers (Reichenbach, Mrs. A. 

 B. Comstock). Males may, of 

 course, result from fertilized eggs, 

 as in the honey bee, according to 

 Dickel, who maintains, indeed, 

 that all the eggs laid by the queen 

 bee are fertilized. Partheno- 

 genesis has been recorded as oc- 

 curring also in a few moths, some 

 Coccidae and many Thysanoptera. 

 Paedogenesis. In Miastor 



and a few other genera of CccidomyiidcB young are produced by the larva. 

 This extraordinary form of parthenogenesis is termed pcedogenesis, and is 

 limited apparently to the family Cecidomyiidae. The paedogenetic larvae 

 of Miastor (Fig. 187) develop before the oviducts have appeared and 



escape by the rupture of the 

 mother. After several suc- 

 cessive generations of this 

 kind the resulting larvae pu- 



FIG. 187. Young psedogenetic larvae of Miastor pa t e anc [ f orm normal male 

 in the body of the mother larva. Greatly enlarged. 

 -After PAGENSTECHER. and female flies. 



An excellent account of 



Miastor has been given by Dr. Felt, who has discovered this remarkable 

 genus in New York State. 



The pupa of a species of Chironomus occasionally deposits unfertilized 

 eggs, which develop, however, in the same manner as the fertilized eggs 

 of the species. 



