114 CALIFORNIA ACADEMY OF SCIENCES. 



differ from the adult, especially in the shape of the head 

 and the markings of the body. 



Description of very young. Body white, with few 

 brown markings. Head short, broadly conical; front 

 rounded; temporal angles with a single long hair; front 

 with two very short hairs on each side (invisible except 

 under high magnification) ; antennae rather short and 

 thick, uncolored; mandibles pale brown; a small black 

 ocular fleck; head otherwise uncolored. Thorax shaped 

 as in adult, with but four long metathoracic hairs instead 

 of six ; prothorax unmarked ; a small fleck at anterior an- 

 gle of metathorax. Abdomen with sides subparallel; no 

 medial markings ; a small lateral marginal blotch on seg- 

 ments 1-7 ; segments 1-4 without hairs at posterior angles. 



Lipeurus densus n. sp. (Plate vii, figs. 1 and 2.) 



A single female specimen taken from a Short-tailed 

 Albatross, Diomedea albatrus (Bay of Monterey, Califor- 

 nia). The form is a well-marked member of the group 

 circumfasciata. As indicated by the clypeus, the simple 

 lateral bands of the abdomen, and the concave posterior 

 margin of the metathorax, it somewhat resembles hetero- 

 grammicHS taken by Nitzsch and Piaget on Perdix cinerea. 

 Description of female. Body, length 4.3 mm., width 

 .81 mm.; white, strongly marked with dark brown and 

 black; sides subparallel. 



Head, length .94 mm., width .75 mm., sides nearly par- 

 allel ; clypeus obtusely angulated in front ; six hairs on each 

 side of forehead, the anterior one longest; trabecular want- 

 ing; antenna? uncolored, second segment longest, as long 

 as fourth and fifth together, first and third about equal in 

 length, with a very few scattered short hairs; eye prom- 

 inent, hemispherical; temporal margin with two minute 

 hair prickles, no other hairs; occipital margin concave; 

 a strong, dark brown band completely bordering fore- 



