206 Journal New York Entomological Society, t^'o'- xxiv, 



are paired plates which are connected with the base of the lancets 

 by a triangular plate. These paired plates overlap the bulb and at 

 the distal ends of the inner pair are borne the elongate palpus-like 

 appendages which enclose the sting. Minute branched hairs are 

 found on the posterior ends of these palpi which are probably tactile. 



Male Genitalia. — The male genitalia are attached to the abdomen 

 by the cardo. This sclerite forms the basal portion and is connected 

 with the stipes on each side dorso-laterally. The stipe is a large 

 lateral plate, the two being usually called the claspers; at the end are 

 two lobes, the outer one usually bearing hairs, known as the lacinia 

 and squama. These are usually fused together in this genus. The 

 stipes extend backward dorsally, laterally and ventrally to form the 

 greater bulk of the genitalia. Included within the extremities of the 

 stipes are a pair of organs called the sagittce. Their distal portions 

 form the greatly recurved head, while the long basal part forms the 

 shaft. Between the sagittje is a foliaceous sclerite called the spatha. 



Wings. — The wings of the carpenter-bee are large and powerful. 

 They vary from hyaline to fuliginous with dark shades of blue, violet 

 and green. A large arched plate, the tegula, slopes over the base 

 of the front wing. Cresson's terminology for the venation is adopted 

 in the present paper. 



Front Wings. — The vein situated at the anterior margin is the 

 costa. About half way along this margin is a weakly pigmented area 

 known as the stigma. The vein just behind the costa and ending in 

 the stigma is the subcosta. The cell included between the costa and 

 subcosta, and terminating at the stigma, is the costal cell. The radial 

 or marginal cell extends from the stigma and is rather sharply pointed 

 at its outer end. The lower margin of this cell is boimded by the 

 radius. Behind the costal cell is the median cell whose lower margin 

 is the median and whose outer margin is the basal vein. 



There are three closed and one open cell just behind the radius 

 extending from the stigma to the outer margin. These are the first, 

 second and third submarginal or cubital cells counting outward 

 from the stigma. Their hinder margins are formed by the cubitus, 

 while their outer margins are formed by the first, second and third 

 transverso-cubital veins. The third submarginal cell is about equal 

 in size to one and two together. Behind the submarginal cells one 

 and two is the large first discoidal cell. The hinder margin of this 



