196 ENTOMOLOGICAL NEWS [May, '17 



Stigmaeopsis celarius n. sp. (PI. XV, figs. 9, 11). 



Yellowish to greenish, mouth parts often reddish. Body about 

 twice as long as broad, broadest in the middle, cephalothorax with 

 two long bristles each side, one at humerus, four near tip of ab- 

 domen, a pair of large ones near the middle of dorsum, and sev- 

 eral pairs of smaller ones above. Legs short, thick, hardly longer 

 than the width of body, with a few simple hairs; one near tip of 

 femur is very long. Palpi somewhat curved outwardly, with an 

 out-turned curved apical claw, the thumb pointed. Mandibular plate 

 narrowed at tip, not notched. 



Length, .3 mm. 



From Oneco, Florida, living in small colonies under small, 

 dense, white webs which are placed here and there, often near 

 ribs, on leaves of bamboo (Bainbusa mctakc) (Sasscer). 



The description of the above three new genera in the 

 Tetranychidae offers an opportunity to tabulate the genera of 

 this family known to occur in our country. The length of the 

 tarsi compared with the preceding joint, a character hitherto 

 unused, readily divides the family into two sections. 



I Tarsi (at least tarsus I) much shorter than the preceding joint; 



at least leg I as long, or longer, than body 2 



Tarsi as long as preceding joint; leg I rarely as long as the 



body 5 



2 Front margin of cephalothorax with a thin four-lobed or cleft- 

 plate; body with scale-like hairs Bryobia. 



No such plate on front of body 3 



3 Body with simple hairs ; prostigmata in a horn each side at base 



of mandibles Tctranobia. 



Body with spines or stiff serrate bristles; prostigmata not in a 



horn 4 



4 Tarsi I enlarged a little toward tip; palpi stout Tetranychina. 



Tarsi I tapering to tip; palpi small and slender; coxae close to- 

 gether Ncophyllobius. 



5 Dorsal surface divided into many small areas; claws two, very 



large Raplni/uathus. 



Dorsal surface not so divided 6 



6 Palpi very slender, and not showing plainly the claw and the 



thumb arrangement; mandibles not elbowed near base 7 



Palpi stouter, showing plainly the claw and thumb arrange- 

 ment : . . . 8 



7 Legs transversely wrinkled; large, bordered ventral aperture; 

 eyes present Tenuipalpus. 



