22 M. ^-^I. Carrikcr 



No measurements are given for the variety, but this form is 

 much larger than .V. brachythorax ccdronun, having a broader 

 head, occipital margin squarely truncate, temples more nearly 

 square, and angles less rounded ; abdomen paler, lateral bands 

 pale fulvous instead of deep brown and median bands barely 

 noticeable. 



Male. — Body, length 1.33 mm., width .40 mni. ; head, length 

 .33 mm., width .33 mm. 



Very abundant on Pfiliogoitys candatus, on the volcano Irazu, 

 Costa Rica, February and April, 1902. 



Nirmus caligineus sp. nov., pi. Ill, fig. 2 



Female. — Body, length 1.83 mm., width .59 mm.; rather short 

 and" stout, pale golden brown, with darker, smoky brown head, 

 smoky brown lateral and transverse bands on abdomen, separated 

 by clear sutures. 



Head, length .53 mm., width .51 mm.; sharply conical, with 

 convex sides, bearing four fine, short hairs, and narrow truncate 

 clypeus ; trabeculae small, colorless ; antennae of medium size, 

 tinged with brownish, second joint the longest; temples broad, 

 narrowly margined with pitchy brown, with evenly rounded an- 

 gles, bearing one long, pustulated hair; eyes small, with a short 

 bristle ; occipital margin concave, occiput slightly convex ; rather 

 narrow, smoky, antennal bands ending at the clypeal suture; 

 paler internal bands enclosing the oral fossa, running backward 

 from the lateral angles of the clypeus, converging slightly in 

 middle and spreading out in front of the mandibles ; mandibles 

 large, chestnut ; narrow occipital bands, but slightly darker than 

 the clear brown temples, running from the posterior roots of the 

 mandibles to the occipital margins; bases of antennal bands con- 

 nected with occipital bands by a very faint band ; small, semi- 

 clear areas at the bases of the antennae, between the antennal 

 and internal bands, and between the occipital bands ; a brownish, 

 oval, occipital signature. 



Prothorax small, quadrangular, with anterior margin concave, 

 posterior flatly rounded, and sides flatly convex and diverging; 

 posterior angles with one short hair; submarginal, deep brown. 



144 



