72 PROCEEDINGS OF THE NATIONAL MUSEUM. '^ol. 57. 



General characters. — Elongate, cylindrical; slender; broadest at 

 mesothorax, tapering gradually to caudal end. Legs and prologs 

 normal. Crochets uniordinal, in a complete circle. No anal fork. 

 Thoracic shield broad, divided; prespiracular shield of prothorax 

 horizontal!}^ elongate, directly anterior to the spiracle. No meso or 

 metathoracic shields. Spiracles small, circular; prothoracic spiracle 

 hardly larger than those on abdomen; spiracle on 8th abdominal 

 segment on the same level as other abdominal spiracles. Tubercles 

 small, but easily distinguished. Body steae normal; prothorax with 

 Ila below the level of la and Ilh, equidistant from both; puncture y 

 caudo-laterad of la, between la and IIu; lb, Ic and lie forming a 

 nearly perfect right angle well separated from la, Ila and lib; lie 

 almost twice as far from Ic as Ic is from lb; III, IV and V in a nearly 

 straight horizontal line, /F equidistant from 77/ and F;meso and meta 

 thorax with seta groups 7 and 77 closely approximate, distance from 

 lb to 77a equal to that between la and lb and 77a and 776; 777 remote 

 from 7FandF; 777, 7F, and Fin aline; F7unisetose; proleg-bearing 

 abdominal segments with 7 and 77 closely approximate, 77 slightly 

 higher than 7, 7F and F approxim.ate, 7F caudad of F, coxal setae 

 {VII) in a line; abdominal segment 8 v/ith 77shghtly lower than 7 and 

 /Fdorso-caudad of V, VII unisetose; abdominal 9 with 77, 7 and 777 

 in a vertical line, well separated, 7 slightly nearer to 77 than to 777, F 

 antero-dorsad of 7F, F7 absent, F77 unisetose. 



Head not retracted within thorax; flattened; circular in outline, 

 viewed from above; as wide or a trifle wider than long; greatest width 

 at middle of head ; incision of dorsal hind margin slightly less than one- 

 half the Vvddth of the head; distance between extremities of dorsal hind 

 margin one-half the width of the head. Frons triangular, long and nar- 

 row, reaching almost to incision of dorsal hind margin; adfrontal ridges 

 straight from lower limits of epistoma to point of juncture of tentorial 

 arms, thence converging in curved lines to a very short Giardly 

 appreciable) longitudinal ridge; points of juncture of tentorial arms 

 at middle of adfrontal ridges; adfrontal areas of frons very narrow; 

 adfrontal sutures nearly straight, extending to incision of dorsal 

 hind margin. Projection of dorsal margin over ventral onl}^ slightly 

 less than the diameter of the head. 



Ocelli six ; equally spaced from 7 to F; F7 equidistant from 7F and F. 



Epistoma normal. 



Frontal punctures close together, well forward of frontal setae 

 {Fl); distance from Fa to Fl greater than from Fl to Adfl and 

 about equal to that between Adfl and Adf2; Adf2 at beginning of 

 longitudinal ridge. 



Epicranium with the normal setae and punctures. Anterior setae 

 {Al, A2, and AS) forming a very obtuse angle, almost in a straight 

 line; Al and A2 dose together; A2 and ^5 well separated; punc- 



