72 University of California Publications. [Zoology 



thicker, especially the second terminal. Rostral filaments long 

 and fairly stout, springing from a papilla. Fourth and fifth 

 thoracic segments fused, abdomen 4-segmented. Anterior an- 

 tennae 25-jointed; mouth parts as in Lucicutia except that the 

 first outer marginal lobe of the maxilla has nine bristles. Rami 

 of all the feet 3-jointed ; the inner marginal bristle of the second 

 joint of the outer ramus of the fifth pair is awl-shaped (PL 13, 

 fig. 69) ; the terminal joint of the inner rami of the second and 

 third feet has eight bristles (instead of five or six), that of the 

 fifth feet with six. 



Male (new) : Head rounded, separate from thorax, last two 

 thoracic segments fused. Abdomen 5-segmented, left blade of 

 furca longer than right. Grasping antenna on left side, 21- 

 jointed, longer than body, portion beyond the geniculation 4- 

 jointed ; mouth parts as in female. Fifth feet not grasping 

 organs (PL 14, figs. 88, 94), with 3-jointed rami: the outer rami 

 are similar in both feet, though not identical ; second basal of 

 each side with a hirsute, flap-like appendage, that of the left foot 

 the longer; terminal joints of inner rami with six bristles. Ter- 

 minal spine of outer ramus of right foot (PL 14, fig. 94) longer 

 than that of the left (PL 14, fig. 88) ; second joint of outer ramus 

 of left foot with a heavier process than in the right foot. 



Disseta grandis n. sp. 



PI. 9, fig. 21; pi. 11, figs. 4.5, 46; pi. 13, fig. 69; pi. 14, figs. 88, 94. 



Female: Rather closely resembling D. palnmhoi Giesbrecht, 

 but much larger (D. palumhoi 5.7 mm.). There are also differ- 

 ences in the structure of the fifth feet and mandibular blade, and 

 the last thoracic segment is asymmetrical, being longer on the left 

 side. The genital segment has a rather more rounded outline 

 than in D. palumhoi, the orifice is of a different shape, and the 

 segment is asymmetrical (PL 11, fig. 46). 



Male : Characterized in the generic description. 



Length : Female, 8.3 mm. Male, 7.6 mm. 



Coloration : The females have a slight amount of orange ma- 

 terial in the intestine and the feet are reddish ; the males are 

 translucent and without pigment. 



