244 

 Trionymus insularis sp. n. j^ 



Adult female oviparous, about 2 mm. long by 1 mm. 

 broad, of a dark pink color. Body slightly covered with white 

 secretion, not sufficient to hide color or segmentation. Ovisac 

 longer and broader than adult, loosely woven. Legs and an- 

 tennae light brown. When placed in liquid potash body turns 

 claret color. Antennae short and stout, eight- jointed, with 

 joint 8 longest. Joint 1 twice as broad as long. Joints 1 

 and 2 subcqual ; joints 3 and 4 subequal ; joints 5 and 6 sub- 

 equal, and joint 7 very little longer than 6. Formula: 8 (1, 

 2), 7 (5, 6), 3, 4. All joints have a few hairs, which are 

 quite long when compared with the length of the joints. On 

 joint 7 there is one and on joint 8 four rather thick, stout, 

 curved spines. Legs short and stout. Coxa and femur much 

 stouter than tibia and tarsus. Femur one-third longer than 

 tibia and tibia one-third longer than tarsus. Olaw long and 

 straight. Digitules of tarsus fine knobbed hairs, those of 

 claw dilated hairs. The legs are quite hairy. Caudal lobes 

 low, indicated by the long, slender setaw. There are two long, 

 fine spines and numerous hairs on each lobe. Anal ring large, 

 with the usual six hairs, which are as thick and subequal in 

 length with the setae. Derm thickly covered with short hairs 

 and round pores; these are more numerous on the cephalic 

 and caudal end of the body. 



Young larva. — Antennae six-jointed. Jont <> longest, 

 about as long as 2, 3, 4 and 5 together. Legs long and stout, 

 especially the femur. Caudal lobes not prominent, with long, 

 fine setae and two sharp spines. Derm shows series of round 

 pores on each segment and scattered over cephalic portion, also 

 many fine hairs. 



Habitat. — On Deschampsia auslrdis, found in a Kipuka 

 on the slopes of Mauna Loa, 6000 feet, Island of Hawaii (0. 

 H. Swezey), and on Cynodon dadylon in various localities on 

 the Island of Oahu, T. H. 



Finding this insect in areas that have escaped lava flows 

 (Kipukas) on the slopes of Mauna Loa would indicate that 

 it has been on the Island for a long time. This species has 

 been successfully transferred to Paspalum conjugatum in the 

 laboratory for study. 



