44 M. A. Carrikcr 



where they join the internal chitin bands; heavy, pale, internal 

 bands run backward from the anterior angles into the abdomen ; 

 the region of the mesothorax and posterior angles deep golden, 

 about the color of the head. Legs long and stout, femora slightl)' 

 swollen, tibia much swollen at the tips and second segment of 

 tarsi unusually large, being almost globular ; femora margined 

 anteriorly and posteriorly, tibiae posteriorly, and tarsi anteriorly 

 with brown. 



Abdomen short and broadly oval, almost clear, with the excep- 

 tion of the transverse bands ; posterior angles scarcely protrud- 

 ing, without hairs ; posterior markings transverse ; eighth seg- 

 ment flatly rounded behind, with a row of short fine hairs ; deeply 

 submarginal, chain-like, chitin bands, extending from the pro- 

 thorax, run almost straight back as far as the middle of the sixth 

 segment ; between these bands are faint golden transverse bands, 

 broken by clear sutures ; outside, in each segment are spots of 

 the same color as the transverse bands ; a few short dorsal hairs 

 on each segment inside and outside of the internal bands. 



Four females collected from Sclasphoriis flauiuuila, on the vol- 

 cano Irazu, April, IQ02. I have placed this species in the genus 

 P/iysosfoiiiuin, but do not think that it rightly belongs there. 

 However, since Mr. Kellogg has placed a very closely related spe- 

 cies (proiiiineus) in this same genus, I will follow him in the mat- 

 ter at present, though I believe that further collecting of Mallo- 

 phaga from hummingbirds will produce additional species of this 

 type, upon which a new genus can be safely established. 



Physostomum leptosomum sp. nov., pi. V, fig. 2 



Female. — Body, length 3.13 mm., width .82 mm.; head and 

 thorax clear pale brown, with brown markings, abdomen brown- 

 ish golden with deep smoky brown, lateral bands. 



Head, length .80 mm., width .61 mm. ; slightly conical, with 

 front Inroad and evenly rounded ; sides straight with two short 

 fine hairs in front of the antennal fossae ; ocular notch small, 

 with three short, fine hairs ; temple produced posteriorly and 

 bluntly pointed, with two rather long and one short hair ; occip- 

 ital margin deeply reentering, occiput very slightly concave ; the 



166 



