Vol. xxii] ENTOMOLOGICAL NEWS. 393 



knowledge left us by Cabot and Hagen by a re-examination of 

 these interesting nymphs. The labial figures and descriptive 

 notes offered herewith are to be considered as supplemental to 

 Hagen's monograph, above cited. 



Figure i is the labium of the nymph No. i of Cabot (1. c. 

 PI. i, fig. 2) and No. 29 of Hagen (1. c., p. 272). It bears the 

 M. C. Z. No. 443. It was at first referred doubtfully (Cabot 

 1. c.) to Herpetogomphus, and later (Hagen 1. c.) to Epigom- 

 plius. An examination of the venation of the developing wings 

 reveals that it cannot belong to either of these genera, but it is 

 probably a member of the not very homogeneous genus Gom- 

 phoides Selys (recently renamed Negomphoidcs) by Muttkow- 

 ski (Bull. Mus. Milwaukee, vol. i, p. 81, 1910).. The triangle 

 of the forewing is three-celled, and the subtriangle is four-cell- 

 ed, there being two cells across the proximal end of it and two 

 cells successively following, one triangular cell occupying its 

 apex. The first and seventh antenodals are hypertrophied ; 

 ante-and post-nodals are 20 and 15, respectively. There is a 

 strong brace vein to the inner end of the stigma, followed by 

 five cross veins behind the stigma. There are seven cross 

 veins at the bridge, one at the subnodus, four before it and 

 two beyond it. 



The labium of this nymph differs from that of Goinphoides 

 stiyinatns (Proc. U. S. Nat. Mus., vol. 27, p. 687, pi. 43, fig. i, 

 1904) in having a slightly longer end hook upon the lateral lobe 

 of the labium, and in having at the front margin of the rounded 

 middle lobe, hidden among the bases of the fringing flattened 

 hairs, two minute brown denticles. Probabh here rs in the bet- 

 ter known genus Gouiphus, the presence or absence of such 

 denticles is merely a matter of specific difference. 



Figure 2 is the labium of another species of Gomphoides, rep- 

 resented in the collection by a fragment of a cast nymphal 

 skin. I was not able to identify it with any of the better pre- 

 serveti forms described by Hagen. The M. C. Z. number it 

 bears is 436 and it bears the further label "Tapajos River, Bra- 

 zil, Thayer Expedition, 1885." 



