6 MISCEKLANEOUS PAPERS. 



DESCRIPTION OF NEW FORMS AND SPECIES. 



Sericothrips apteris Daniel, male. (PI. II, fig. 1.) 



Length 1 mm. Similar to female except that it is usually lighter 

 in color; legs light brown; usually the abdomen, except the last two 

 segments, uniform dark brown; the basal two and the apical two 

 segments sometimes light brown similar to the pterothorax. Seg- 

 ment 9 of abdomen with two very stout, . bluntly-pointed, black 

 spmes upon the middle above, standing close together. 



Described from five specimens collected on grass and weeds during 

 March, April, and June, at San Jose, Cal. (P. R. Jones). 



This is a very variable species and I have one specimen with the 

 head dark brown and the remainder of the body uniform light brown. 



Sericothrips albus new species. (PI. II, figs. 2-5.) 



Measurements: Head, length 0.1 mm., width 0.18 mm.; prothorax, 

 length 0.13 mm., width 0.23 mm.; mesothorax, width 0.33 mm.; 

 abdomen, length 0.78 mm., width 0.30 mm. Antennae: Segment 1, 

 21 n; 2, 36 [x; 3, 45 /i; 4, 45 (x; 5, 45 //; 6, 57 n; 7, 12 n; 8, 18 n; total 

 length of antennae 0.29 mm. Total body length 1.25 mm. 



General color very pale, transparent white, devoid of any dark 

 marking, except eyes, ocelli, mouthparts, apical joints of antennae, 

 and spot upon tarsi. 



Head nearly twice as wide as long, retracted within the prothorax, 

 considerably depressed in front where the antennae are received; 

 cheeks full, converging posteriorly. Eyes large, protruding a little, 

 nearly black, coarsely faceted, pilose. Ocelli approximate, situated 

 upon a slight raised area between the eyes, very light yellow, with 

 dark reddish-brown crescents; posterior ocelli not contiguous with 

 inner margins of eyes. Spines upon head inconspicuous, but one 

 short, curved spme on each side of fore-oceUus, and two similarly 

 curved spines across the front; sides with several short spines and a 

 number of very small microscopic hairs. Mouih-^one very long, tipped 

 with black, extending past posterior margin of prosternum a con- 

 siderable distance upon the mesosternum. Maxillary palpi slender, 

 three-segmented. Antennae, about three times as long as head, well 

 separated by the projection of the head; segment 1 short and thick; 

 segment 2 wider than 1; segments 3 and 4 fusiform; segment 5 fusi- 

 form at base, broad at apex where it joins segment 6; segment 6 

 tapering gradually from base with style to tip of antennae. Color 

 of antennae pale transparent white except apex of segments 4 and 5, 

 and segments 6, 7, and 8 which are entirely gray; a forked sense- 

 cone on segments 3 and 4. 



Prothorax slightly more than twice as wide as long, angles rounded, 

 striated transversely upon dorsum; one short spine on each anterior 

 angle, and one upon each posterior angle. Pterothorax large, about 



