( 557 ) 



on the head. This fan (F) is not always so distinct as in onr text-fig. 1. The 

 whole arrangement, however, appears to act also as a bnflPer when the clipeus is 

 bent down too much. The movabilit3' of the clipens is verj' limited, as tested at 

 alcohol specimens. The organ cannot freely be flapped up and down, but only be 

 tilted ;it an obtuse angle, its halfmoon-sbape and the membranous connectioji with 

 the head alone would, under ordinary circumstances, prevent any too great upward 

 or downward movement. But even under exceptional pressure from front, the 

 helmet, on account of the buffer, cannot flap so much down as to be in the way 

 of the proboscis when the latter is stretched downward and perhaps a little forward 

 in the act of sucking. At tlie lateral margin there are always four grooves whose 



TE.\'T-KIf;. 1. 



posterior edges are more or less strongly raised in tubercle shape, each groove 

 bearing a very thin bristle, the anterior groove generally two very small ones. 

 Near the angle there is, as above, a long bristle. In one of the species 

 (PI. XIV. fig. 11. 12) three of these bristles are replaced by short, thick, stumpy 

 spines, and the posterior bristle is proximally broad and ends in a long point, 

 the anterior groove, whose edges are not elevate, bearing several minute hairs. 

 The lateral posterior portion of the clipeus is more or less excavated to allow for the 

 reception of the first antennal segment. 



The proboscis is described as consisting of three segments, and containing four 

 long bristle-like jiiercing organs. This statement does not appear to have ever 

 been modified. It is true that in Speiser's figure of intermedium (1 004) the 

 proboscis is divided into four segments, but that is clearly due to a mistake on 

 the part of the lithographer. As regards the number of segments, we find that 



