186 Mr. R. MacLachlan^s Monograph of 



Head and thorax rusty ochreous, broadly shining 

 blackish on the sides, and with a narrow blackish median 

 longitudinal line ; face shining black ; antennoe ochreous, 

 closely annulated with blackish. 



Ahdomen dull brown, with golden hairs. In the $ 

 the appendices are broad and band-like, dilated and trun- 

 cated, the apex produced downwards into a narrow 

 slightly-curved spine-like appendage, the tip of which is 

 furnished with a tooth like the barb of a fish-hook, only 

 that it is placed externally (PI. X. fig. 8) . In the ? the 

 apex of the abdomen is obtuse. 



Legs yellowish, the anterior and intermediate femora, 

 tibiffi, and tarsi broadly annulated with blackish fuscous. 



Wings rather elongated, the apex elliptical : anterior pair 

 pale grayish fuscous, with numerous narrow angulated 

 transverse whitish lines, the gradate veinlets margined 

 with dark fuscous, simulating fasciae, and some strong 

 fuscous spots along the lower cubitus ; the dorsal margin 

 pale, slightly ochreous at the base ; costal margin mth 

 pale spots; longitudinal veins and costal veinlets blackish, 

 with numerous whitish interruptions ; hairs pale ; three 

 sectors ; gradate veinlets strong and black, six to seven in 

 the outer series, six in the inner, two or three at the 

 base ; post-costal cellules both closed ; pterostigma indis- 

 tinct : posterior pair iridescent, pale grayish ; the veins 

 darker. 



Length of body 3-3^ lines ; expanse of wings 7^-9 

 lines. 



Excessively abundant throughout the summer, espe- 

 cially about London, hiding in the chinks of the bark 

 of fruit-trees, etc. 



Varies considerably in intensity ; sometimes the wings 

 are uniformly almost blackish-fuscous, at others they are 

 pale, with an appearance of many dark irrorations, and 

 in this state more resemble H. nervostis. It may be 

 always distinguished by the peculiar form of the male 

 appendices. 



I have never seen a continental example, nor is it 

 known as such by Hagen or Brauer ; yet the description 

 of H. strigosus, Zett. (Ins. Lapp. 1048) suits the insect 

 tolerably well. I can scarcely believe that a species so 

 common in England should be peculiar to our islands. 



The variety pereJcgans is a most beautiful form, in 

 which the wings are strongly sufiused with fuscous, with 

 pale spots on the margins. I had pre\aously wrongly 



