1 6 M. A. Carrikcr 



Prothorax, small quadrilateral, anterior margin slightly con- 

 vex, posterior transverse, sides convex; posterior angles with one 

 weak hair ; deep, almost pitchy brown, lateral bands, sHghtly sub- 

 marginal, curving around on posterior portion of segment, but 

 separated medially ; coxal lines show faintly ; interior of segment 

 paler than the head ; a small clear pustule in the posterior angles. 



Metathorax much larger than prothorax, pentagonal, sharply 

 angulated on abdomen ; sides convex, diverging ; posterior angles 

 with two slender hairs and two more on each side of posterior 

 margin ; a pitchy spot in the anterior angles, a large pitchy blotch 

 running inward from the posterior angles, narrowing and nearly 

 meeting in center; remainder of segment same color as head. 



Legs very short and stout ; concolorous with head, margined 

 anteriorly with pitchy and femora semiannulated at tips. 



Abdomen long, subclavate, pointed abruptly by the last two 

 segments ; posterior angles rounded and protruding with a single 

 weak hair in segments three to six, three in segment seven, and 

 three on each side and two on posterior margin of eighth seg- 

 ment; ninth segment small, colorless, indented at tip; segments 

 one to seven with deep, smoky brown lateral bands having a 

 pitchy hue through the middle and extending anteriorly into adja- 

 cent segments ; smoky brown transverse bands on segments one 

 to eight, separated by broad clear sutures and having in segments 

 two to seven, two median longitudinal rows of darker, quadri- 

 lateral blotches, joined on segments six and seven; large clear 

 pustules on segments two to seven, just within lateral bands. 



Male. — Body, length 1.34 mm., width .32 mm.; head, length 

 .32 mm., width .25 mm. ; differs from the female only in size and 

 in the color and shape of the eighth and ninth abdominal seg- 

 ments, the eighth being clear, except for a narrow brown band 

 around the anterior margin, while the ninth is very small and 

 obscured with brownish; genital hooks small, short, and blunt, 

 being only the length of the eighth abdominal segment. 



Numerous males and females collected on Muscivora tyranmis 

 and Tyranmis inelancholicus, at Juan Vinas, Costa Rica, March, 

 1902. This is quite a distinct form, though resembling somewhat 

 in shape of head and abdominal markings A'^. atigusfifrous Car. 



138 



