NO. II NEOTROPICAL DICTYOPHARIDAE FEN N AH 7 



which it differs strongly in the distinctly narrower frons and more 

 elongated vertex as well as in the relatively longer apical areoles in 

 the tegmen. H. truncahim is superficially very similar to H. teapanum 

 but differs in having the lateral lobes of the pronotum wider than deep, 

 while in teapanum they are deeper than wide. In truncahim cell 

 M 1+2 in the corium is much shorter than its stalk, while cell Cui is 

 about as long as its stalk; in H. teapanum both these cells are longer 

 than their respective stalks. The stigma of H. truncatum is 5-celled. 

 The most significant difference among the specimens available was 

 found in the shape of the third valvulae of the ovipositor, these of H. 

 truncatum being much more slender than in teapanum (see figures 

 from holotypes). 



HYALODICTYON PLATYRHINA (Walker) 

 Plate i, figure 12 

 Dictyophara platyrhina Walker, 1851, List Horn., vol. 2, p. 311. 



This species is almost as large as nodivena (Walker) from which 

 it differs markedly in the longer vertex and relatively broader and 

 transverse apex. It is nearest in appearance to H. teapanum, but the 

 lateroapical angles of the head are more prominent and the anterior 

 margin of the vertex is truncate, not rounded as in the latter species. 

 H. platyrhina is the most readily recognizable species in the genus. 



HYALODICTYON FUSIFORME (Walker) 

 Plate i, figure 18 

 Dictyophara fusifonnis Walker, 1851, List Horn., vol. 2, p. 315. 



This species is distinguished from all the preceding by the relatively 

 narrower vertex, the obtusely rounded lateroapical angles, and the 

 rounded apical margin. The type is not quite so large as the preceding 

 species. 



HYALODICTYON FALLAX Fennah 

 Hyalodictyon fallax Fennah, 1945, Proc. U. S. Nat. Mus., vol. 95, p. 456. 



This species, as noted in the original description and shown in plate 

 II, figures 239-242, differs from H. truncatum (Walker), which it 

 generally resembles, in the straight sides of the vertex and frons. This 

 distinction has been found to hold good in specimens more recently 

 taken by the writer (2 $$, Maracas pool, Trinidad, Sept. 28, 1945). 



