no. 1834. NEW SPECIES OF STREPSIPTERA— PIERCE. 495 



Female. — Length of cephalothorax 0.88 mm., breadth at spiracles 

 0.88 mm., breadth at base of head 0.52 mm., distance between mandi- 

 bles 0.10 mm. Cephalothorax orange yellow, with disk lighter, and 

 with a wide sharply marked dark brown band at base, half on the 

 thorax and half on the abdomen, and not reaching the sides of the 

 thorax in front of the constriction. Cephalothorax as long as broad, 

 truncate at apex, the truncation slightly more than one-fourth the 

 breadth at the spiracles. Lateral margin almost straight from spira- 

 cles to apex, having a slight sinuation at base of head and also just 

 before apex. Mandibles obtusely rounded, not toothed. Cephalo- 

 thorax with sides parallel for a short distance behind the spiracles and 

 then strongly constricted. Spiracles slightly prominent on margin. 



Type.— Cut. No. 13691, U.S.N.M. 



STYLOPS NUDiE, new species. 



Host. — Andrena nuda Robertson (det. Robertson), Carlinville, Illi- 

 nois. Described from one female collected by Charles Robertson. 



Female. — Length of cephalothorax 0.80 mm., breadth at spiracles 

 0.81 mm., breadth at base of head 0.42 mm., distance between mandi- 

 bles 0.10 mm. Cephalothorax orange yellow, with disk lighter, and 

 with a dark brown band at base, extending equally onto the abdo- 

 men, irregular in outline and fading out on the edges. Cephalothorax 

 as long as broad, truncate at apex, the truncation about one-fourth 

 the breadth at the spiracles. Lateral margin almost imperceptibly 

 convex from spiracles to apical truncation. Mandibles small, apically 

 toothed. Spiracles laterally prominent. Cephalothorax with sides 

 convexly narrowed behind the spiracles to a strong constriction. 



Type.— Cat. No. 13692, U.S.N.M. 



STYLOPS PILIPEDIS, new species. 



Host. — Andrena pilipes Fabricius (det. Cockerell), Pekin, China. 

 Described from one specimen collected by M. L. Robb, April 21, 1901. 



Female. — Length of cephalothorax 1.30 mm., breadth at spiracles 

 1.26 mm., breadth at base of head 0.83 mm., distance between man- 

 dibles 0.14 mm. Cephalothorax reddish orange, with disk lighter, 

 and with a dark brown band at base, equally on thorax and abdo- 

 men. Cephalothorax slightly longer than broad, rounding truncate at 

 apex, the truncation less than one-fourth the breadth at the spiracles. 

 Lateral margin strongly convex with several very slight indentations. 

 Mandibles obtuse, not toothed. Spiracles touching lateral margin 

 but not prominent. Cephalothorax with sides almost parallel for a 

 short distance behind the spiracles and then very strongly constricted. 



Type.— Cat. No. 13693, U.S.N.M. 



This is the largest female Stylops yet known to the writer. 



