50 Trans. Acad. Sci. of St. Louis. 



Andrena corni n. sp. 



5. — Closely resembles A. pruni 5 in size and color; mid- 

 dle of mandibles rufous ; process of labrum triangular, trun- 

 cate ; clvpeus more closely and finely punctured, less shining, 

 more pubescent, median raised line less evident, joint three of 

 antennae longer than next two together, facial foveae broad, 

 not widely separated below from eye margin; inclosure of 

 metathorax more rugose ; abdomen less shining, more closely 

 punctured, legs more ferruginous. Length 11 mm. 



Carlinville, Illinois; 1 $> specimen. 



Andrena andrenoides Cr. 



Parandrena andrenoid<s Robertson, Trans. Acad. Sci. St Louis. 7 : 337. 

 1897. 



Andrena wellesleyana Rob. 



Parandrena wellesleyana Robertson, Trans. Acad. Sci. St. Louis. 7 : 337. 

 1897. 



When this name was proposed it was stated that it was 

 little more than a section of Andrena. It is proposed here 

 to reduce it to that rank. It is certainly a natural group in 

 which the two above species have originated from a common 

 ancestor whose wings had only two submarginal cells. Never- 

 theless, except as an expedient for separating the species 

 having only two submarginal cells, we are hardly justified in 

 giving a special name to this group of Andrena unless we are 

 ooing to divide the genus into several named sections. 



The second transverse cubital nervure is the most unstable 

 element in the venation of bees. Its presence is not con- 

 stant in ordinary species of Andrena, as I have found it want- 

 ing in specimens of Andrena, platyparia, solidagiiris, bipunc- 

 tata, hippotes, roberlsonii and cl<njloniae. Its obliteration 

 seems to be constant, and of quite independent origin, in 

 species referred to Biareolina Dours, Callandrena Ckll. 

 and Parandrena Rob. To establish a new genus for every 

 one, or every set, of these anomalous Andrenas, now seems 

 to me to be unnecessary. 



Iomelissa n. g. 



This is proposed for the reception of Andrena violae Rob. 

 Scopae, facial foveae and venation as in Andrena, the basal 



