NEW MALLUl'ilAUA. 135 



posterior margin. Dorsal surface of the abdoiiien with 

 a few scattered, longish hairs; ventral surface witli 

 groups of short, strong spines and some longisli hairs 

 on the hiteral part of tlie posterior margins of segments; 

 hist segment broadly rounded beliind, with fringe of 

 weak hairs of different lengths. 



Menopon ridulosum n. sp. (Plate TX, fig. 4). 



Specimens from two Yellow Warblers, Dendroica 

 cestiva (Palo Alto, California). A small, heavy-bodied 

 form . 



Description. Body, length 1. mm., width .53 ram.; 

 being thus a very small species; head large compared 

 with the rest of the body; head almost as wide as long; 

 abdomen with narrow transverse abdominal bands. 



Head, length .40 mm., width .51 mm.; large, nearly 

 as broad as the abdomen; front broadly parabolic, 

 with a slight median angulation; two short hairs in 

 front each side of the angle, several shorter hairs in 

 the frontal margin, two longer hairs on the lateral mar- 

 gin, and two long hairs on the angle before the shallow 

 ocular emargi nation; eye with a l»lack ocular fleck; ocu- 

 lar fringe distinct; two very long hairs on the narrowly 

 rounding temples and several short spines; occipital 

 margin concave, with four long hairs on the margin; 

 two small angular blackish spots on the lateral margin 

 of the front outside the mandibles, wMiich are also 

 dark, showing through the head; ocular blotches curv- 

 ing, blackish brown, fading on the anterior portion of 

 the ocular emargination; a narrow band of dark black- 

 ish brown on the occipital margin. 



Prothorax wide; a long hair autl short spine on the 

 anterior angle; a series of long hairs on the rounding 

 posterior margin; dark transverse and longitudinal 



