462 ENTOMOLOGICAL NEWS [Dec., 'lO 



Description of male. Length, 1.6 mm.; width, .64 mm. across abdo- 

 men; general color pale, with light yellow on thorax and abdomen. 

 Head: Length, .3 mm.; width, .48 mm.; front rounded; sides con- 

 cave opposite the mandibles, then expanding before the antennae; 

 remainder of margin slightly concave ; posterior angles narrowly 

 rounded. There are several minute hairs on the front ; five short 

 spines around the posterior angles, one of which, on the posterior 

 margin, is very heavy; also one long spine on the posterior angle; ? 

 row of short spines on the dorsal surface extending from the man- 

 dibles along the faint occipital bands to the posterior margin with the 

 marginal spine of this series long and heavy; occiput slightly sinuous. 



Thorax. Length, .44 mm. ; width, .24 mm. ; pro- and metathorax 

 similar, the metathorax resembling the prothorax inverted ; prothorax 

 slightly longer and slightly narrower than the metathorax. Four 

 short, stout spines at the anterior angle of the prothorax ; two nar- 

 row longitudinal chitinous bands parallel to the margin on the pro- 

 thorax with a long heavy spine arising at the posterior termination 

 of each band. Two long heavy spines occur in the same relative po- 

 sition on the metathorax. Other spines as shown in the figure. 

 There are numerous heavy spines on the ventral surface of both head 

 and thorax. Legs pale in color. 



Abdomen. Length, .8 mm.; width, .6 mm., oval. An indistinct yel- 

 lowish band and two rows of spines on each segment except the last; 

 a heavy, long spine on each posterior lateral angle, except the last 

 three, where two occur; length and strength of spines increasing pos- 

 teriorly, those of the last segments being very heavy and long. Geni- 

 talia dark and conspicuous, extending almost to the thorax, and of 

 unusual type. 



Female. 'Length, 1.72 mm.; width across abdomen, .68 mm. A 

 fringe of fine hairs occurs on each side of the ventral surface of the 

 last segment of the abdomen; this segment is rounded. 



Gyropus ovalis Giebel. 



Specimen from a guinea pig, Cavia cobaya, (Canal Zone, 

 Panama) . 



Trichodectes sp. 



A single poor specimen from a rat, Mus rattus (Canal Zone, 

 Panama). Also two specimens of a wingless Psocid (Atro- 

 pidae) were sent with the lot labelled "parasites from Mns 

 rattus." It would be very interesting if we could know that 

 these Atrotpids were really living on the rats feeding on the 

 hair or dermal scales. Kellogg has found Atropids in rats' 



