164 Mr. G. R. Waterhouse's Notes on 



at the humerus : a second band springs from the side of the elytra 

 in the same manner, but considerably below the middle, and is 

 recurved so as to join what I will call the second discoidal spot, 

 and which is placed but little below the middle of the elytron ; the 

 first discoidal spot being placed between this and the base of the 

 elytra ; besides these, there is a spot at the base of the elytron 

 near the scutelliim, and another which, from its position, may be 

 termed the sub-apical spot. Moreover, the outer margin of the 

 elytron is also frequently pale,] 



In H. Icev'igatus the margin of the elytra is entirely pale; the 

 two bands run inwards but a short distance from the margin, and 

 then are abruptly truncated; the sub-humeral band descends 

 lower than usual, and hence is separated by a narrow space only 

 from the second band ; its inner ascending branch is commonly 

 (but not always) isolated. The basal spot sends down a branch 

 to join the first discoidal spot ; the second discoidal is free, and 

 divided longitudinally by a dark line, as is also the sub-apical 

 spot. 



[The mandibles in the Heteroceri are obliquely cleft, or notched, 

 on the outer margin, about midway between the base and apex of 

 the jaw, and a salient point is thus produced at that part. Now 

 in the males the margin between the notch and the base of the 

 tooth is frequently recurved, and produced into a vertical lobe.] 



In H. marginatus, $ , the lobe referred to is small and pointed ; 

 the clypeus is provided in front with two minute acutely-pointed 

 processes, and these are rather widely separated ; and the thorax 

 is as broad as the elytra. 



Four, out of five specimens which stand as H, Icev'igatus in 

 Stephens' Collection, belong to the present species ; the fifth 

 specimen is H. marginatus. 



The //. Maryland, of Stephens, is represented in the same Col- 

 lection by two specimens, both of which belong to the //. Icev'i- 

 gatus. 



Common on the muddy margins of ponds and ditches in the 

 neighbourhood of London, and I believe widely distributed in 

 England. 



Heterocerus ohsoletus, Curtis, British Entom. v. 224. 



, Steph. Illustr. ii, 102, 5 ; Man. 80, 622. 



~— — — — , Kiesenw. Germ. Zeitschr. iv. 215, 14, pi. 3, 



fig. 9. 

 . ., Erichs. Ins. Deutschl. iii. 5'i5, 4. 



marginatus, Marsh. Ent. Brit. p. 400, 1. 



