656 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 56. 



a single eye cornea on each side, and the ratio of the frontal to sub- 

 frontal bristles is 3:5. The collar trachea appears about like that of 

 himaculatus. 



In Banks's type collection there was a species that lie had indicated 

 as new and had given it the manuscript name T. peruvierisis. It is 

 well to record at this point that this species likewise agrees thoroughly 

 with himaculotus when subjected to a very close study. 



At the time of publication of previous papers on T. bimaculaivs 

 by the writer a realh^ ultramicroscopic examination with the aid of 

 the oil immersion equipment (such as we have more recently adopted 

 as the necessary standard) had not been made. Such intensive 

 studies have since been conducted (see pi. 76, fig. 1), and I can cor- 

 roborate Ewing's (17) description of the tarsal appendages wherein 

 he says : 



Tarsal claw strongly curved at its base, * * * tlien divided into six pronglike 

 elements * * * arranged in three pairs. 



Description of female of T. himaculatus Harvey: 



Color variable; at times rusty green, sometimes greenish amber, or 

 yellowish, at times almost black, but more often brick red or ferru- 

 ginous red. Pigmented blotches occur almost invariably on the sides 

 of the body, which are usually coalesced to form two large dark spots, 

 one on each side extending from the back of the cepiialothorax to the 

 posterior region of the abdomen. These are often interrupted pos- 

 teriorly to form a large anterior and a small posterior spot. These 

 spots arise from underlying paired organs. Almost directly over 

 coxae II are the carmine eyespots located on each side near the 

 margin of the cephalothorax. Legs pale amber, much paler than 

 ground color of body. Palpi pale salmon. Dorsal bristles pale, not 

 arising from tubercles. Body pyi-iform oval, widest across posterior 

 region of cephalotliorax; bristles in four rows, each succeeding pair 

 becoming shorter; the frontal pair a little over half as long as the 

 subfrontal pair which, like the median pair next behind, are two- 

 fifths the greatest width of body. Mandibular plate about twice as 

 long as broad, tapering sliglitly forward, broadly rounded at tip, with 

 a slight median notch. "Thumb" of palpus in shape somewhat like 

 a truncated cone, the dorsal face about one-third longer than the 

 greatest width at base, the upper surface twice slightly depressed 

 transversely, with an intervening dilation, bearing on its tip a sub- 

 oylindrical "finger" which is about two-fifths as wide at its base as 

 the distal end of the "thumb." On its upper side, just above the 

 "finger," are two stout, straight hairs arising close together, one 

 medially and the other laterally, which do not greatly exceed in length 

 the "finger." Near the middle of the upper side is a small "finger" 

 three-fourths the length and one-half the width of the terminal "fin- 

 ger" and verv similar to the latter. Between this dorsal "finsrer " and 



