THE CANADIAN ENTOMOLOGIST. 1()3 



anterior surfaces of tibiae and metatarsi yellow. Hind legs without distinct 

 yellow markings. Wings milky-white, with pale veins and stigma. An 

 oval black spot in the stigma takes up the greater part of its area, leaving 

 only a portion of the base, and a narrow strip along the costa unoccupied. 

 Type taken August 13, 1905, at Milwaukee, Wis., flying around its 

 nest in sandy soil. (No, 31740.) 



Fourteen paratypes, Aug. 6 and 13, 1905, and June 30, 1906, from 

 the same locality, all of them obtained in the vicinity of their nests. 



This species is easily recognized on account of the black spot in the 

 stigma, a character which it has in common with P. macuUgera Ckll., but 

 the latter is a yellow insect with dark markings, while in maculipennis the 

 dark predominates, 



Perdita citritiella, n. sp. 



Female. — Length about 6 mm. Pale lemon-yellow with a greenish 

 tinge in the metathoracic region, and black marks which are distributed as 

 follows : Ocelli, a spot, usually diamond-shaped on each side of the front, 

 situated half-way between the upper ocellus and the base of the antennje ; 

 between this spot and the eye a narrow line extending to a point opposite 

 the base of the antennse ; a large spot on the thorax underneath, occupy- 

 ing the area between the anterior and middle coxae (mesosternum) and a 

 smaller spot in front of this (prosternum), both spots reaching the pleural 

 region ; on the margin of the second abdominal segment a short slender 

 line; on the anterior surface of each femur a conspicuous shining longi- 

 tudinal band. These markings are more or less developed in all of the 

 specimens, and in addition to these some specimens show a dark color- 

 ation of the sutures of the face and thorax, a black spot on the hind sur- 

 faces of the hind tibijB near the tip, black hind tarsi, and narrow black 

 apical bands across the abdominal segments, dorsally as also ventrally. 

 In the latter case the bands are more in the basal region of the segments. 

 There may be also two or more minute black dots on the clypeus. 

 Antennae reddish below, black above. Mandibles yellow, with reddish or 

 brownish tips. Pygidium reddish-brown. Wings white, with light veins 

 and stigma. Soft white pubescence on legs, lower part of thorax and apex 

 of abdomen, moderately close on legs, otherwise sparse. 



Type: August 13, 1909, North Hudson, St. Croix Co., Wis. (No. 

 303S9-) 



Six paratypes, Aug. 13 and 14, 1909, at the same locality. Type and 

 paratypes in the collection of the Milw. Publ. Museum. 



