290 



ARACHNOIDEA, 



CASE We should now pass to the Sarcoptidae, but before doing so, we 



^^^' have a form to dispose of, that we have not known very well where 



to place. Probably it should come in beside Hypopus, but it 



would have disturbed the sequence we were following, and we 



bring it in here as an insect incericE. sedis. 



Nos. Heteropus VENTRIC0SI7S {Newport, Linn. Soc. Trans. 1850).— 24. Magnified 

 *4' ^^- sketch of perfect insect newly developed ; 25. Not so much magnified 



sketch of impregnated female, copied from Newport's figure. 



This anomalous-looking insect was found by Mr. Newport, 

 parasitic in the nests of the bee Anthophora retusa, in England. 



Heteropus ventricosus mature (either 

 male or unimpregnated female). 

 Copied from Newport's figure. 



Heteropus ventricosus, im- 

 pregnated female. 

 Copied from Newport's figure. 



Leg of ditto. 

 Copied from 

 Newport. 



The leg, which we also figure, is also puzzling in its affinities. 

 The female with eggs, attains a size four times that of the male, or 

 unimpregnated female. For a full account of its anatomy, we 

 refer the reader to Mr. Newport's paper. It is no doubt the same 

 species, or a similar one, to that alluded to by M. Lichtenstein in 

 Bull. Ann. Soc. Ent Fr. 1868, under the name of Physogaster 

 larvarum, described as having a vesicular abdomen, and living on 

 larvae of Hymenoptera. 



