51 



bindings of books bound in cloth. The use of Ryrethruni powder 

 on the shelves is the best remedy. It has been recommended to 

 mix a teaspoouful of powdered arsenic with a tablespoonful of 

 mashed potato, and scatter about their lurking-places ; but, when 

 poison is used, the greatest caution is necessary to i)revent acci- 

 dents. 



Borax is also said to be useful iu destroyiug the croton bug. 



Blatta? flavocinx'ta. Scudder. 



" Prothoracic shield rather dark brown, slightly paler along the 

 median line, bordered throughout with a pale yellowish band, 

 forming only a very narrow edge posteriorly ; broader in front, 

 and quite broad at the sides, covering all the deflexed border ; the 

 edge at the sides and front is slightly raised ; Aving covers scarcely 

 reaching the tip of the abdomen, reddish brown, with the anterior 

 half of the outer margin paler, with a yellowish tinge ; wings not 

 half the length of the wing covers ; abdomen above very dark 

 brown; below, dark brown, the terminal segment being darkest; 

 legs yellowish brown, with spines as in B? Uthophila; head reddish 

 brown ; sides below antenuic yellowish ; eyes black ; antennte dark 

 brown, paler toward tip ; third joint rather larger tlian the two 

 succeeding joints, and equal in size to the second. Length of 

 body, fifty-six hundredths of an inch." 



Mr. Scudder placed this species and germanica under the genus 

 P^CTOBiA, and it may not be properly placed here, lie also 

 described a species under Ectoiua as Jithophila (a manuscript name 

 of Harris) ; but he informs me that it is very likely to be the larva 

 of Platamodes liGnnsylcanka. 



Genus PKUiri.AXinA. Burmeister (1838). 

 Last abdominal sternum of the female divided ; sub-anal styles 

 of the male well developed. Antenme slim and "tapering, longer 

 than the body. Legs long and very spiny. 



I Winn covers and wiiiirs cxtciidiii;;- beyond the end of tlic 



J abdomen in bot!i sexes (tmericana. 



1 Wing covers and winiis not rcacliinfj to the end of tlic 



^ abdomen in tiie males, inidinK'ntary in tlic females. . orientalis. 



PicuiPLANKTA A MKiticANA . Fabricius. 

 Length, one inch and one-fotuth. Color, reddish brown, with 

 paler indistinct bands on the pronotum. VVings and wing covers 

 well developed in both sexes, and extending beyond the end of 

 the abdomen. Legs much lighter in color than the l)ody. 



