1914] !07 



named insect ; and if there still be any doubt that H.fungivora should 

 rank as a species, a comparison of these organs should dispel it. 

 Fig. 11 is a diagram of the genitalia of H. monticola male, a species 

 unmistakeable by reason of its distinctive secondary characters. The 

 sketch is added merely to complete the trio. The square elytra of the 

 females of this species enable one pretty readily to separate them from 

 the females of occulta and fungivora, in which these organs are oblong, 

 but, when I commenced the examination, I did not find the two latter 

 species very easy to distinguish the one from the other. Apparently 

 this is not an uncommon experience, as I have females of occulta which 

 were sent to me some time recently as fungivora. The following 

 characters may therefore be found useful for purposes of identi- 

 fication : — 



1. Eighth dorsal segment narrowly and distinctly emarginate in middle 



of hind margin ; ninth dorsal segment with central lobe truncate, or 

 at most with a slight trace of a tooth (Fig. 7) occulta, ? . 



2. Eighth dorsal segment completely rounded or sometimes almost im- 



perceptibly truncate in middle ; ninth dorsal segment with central 

 lobe triangularly produced in middle (Fig. 8) .fungivora, ? . 



H. monticola, female, has the 8th segment more widely and dis- 

 tinctly emarginate than in occulta, and the lobe of the 9th produced 

 as in fungivora. The males of all three species have the lobe truncate. 



Comparison of length of occulta with fungivora is not a reliable 

 character, as some of my examples of the latter were fully 3| mm. 

 long. 



The female genitalia of these species, or at all events, of occulta 

 and fungivora, I found to be almost entirely membranous, and there- 

 fore unavailable for specific purposes. 



Figs. 1 — 6 are all of the same magnification, but the side lines 

 are abbreviated by about one-half ; 7 and 8 are of equal magni- 

 fication ; 9, 10, and 11 are also equally magnified, but more 

 highly than the other figures. 



7, Whim pie Street, 



Plymouth : 

 February 21st, 1914, 



