THE NEARCTIC EVANIIDAE — TOWNES 531 



Genus HYPTIA Dliger 



Hyptia Iixiger, Mag. Insekt. (Illiger), vol. G, p. 192, 1807. Type: Evania pcti- 



olata Fabricius. Monobasic. 

 Eyptiam Shxjckakd, Entomologist, vol. 1, p. 120, 1841. Emendation. 



This genus is easily distinguished from others in the Nearctic Region 

 by the partial or complete absence of the notaulus and by the reduced 

 venation. Only the subcostal cell of the fore wing is enclosed. The 

 species are restricted to the New World, with most of them in the Neo- 

 tropics. 



The Nearctic species vary considerably in color, which has led to the 

 creation of some synonyms. All six may have the head, thorax, and 

 first tergite either entirely black or partly to entirely ferruginous. 

 The forward and upper parts of the thorax are the regions most fre- 

 quently ferruginous, and the ferruginous coloration is most frequently 

 and extensively developed in specimens from the southern parts of the 

 ranges of the various species. 



Our species are on the wing mostly in midsummer and, at least in the 

 North, seem to have a single generation a year. Adults occur in woods. 

 The commoner species {thoracica^ reticulata^ and harpyoides) are 

 probably all parasites of Parcohlatta spp., though the rearing data are 

 scanty. 



KEY TO THE3 NEARCTIC SPECIES OF HYPTIA 



1. Mesoscutum about 0.54 as long as wide ; forewing about 2.3 mm. long ; lower 



part of mesopleurum with only fine punctures or with a very few coarse 



ones (fig. 44, e) .">. floridana Ashmead 



Mesoscutum 0.65 to 0.95 as long as wide ; forewing 2.5 to 4.8 mm. long ; lower 

 part of mesopleurum with scattered large coarse punctures (fig. 44, a-d, /)_ 2 



2. Mesopleurum near its upper posterior margin with oblique rugae (fig. 44, /) ; 



mesoscutum about 0.90 as long as wide ; forewing 2.6 to 3.7 mm. 



long 6. oblonga, new species 



Mesopleurum near its upper posterior margin without oblique rugae (fig. 44, 

 a-d!); mesoscutum 0.65 to 0.8 as long as wide; forewing 3.5 to 4.8 

 mm. long 3 



3. Median posterior corner of mesopleurum not containing a subcircular depres- 



sion, though often with a group of depressions nearby (fig. 44, a, b) 4 



Median posterior corner of mesopleurum containing a subcircular depression 

 (fig. 44, c, d) 5 



4. Punctures on frons so close that they are angular and separated by 



sharp ridges; hind femur beneath with rather dense small weak 



punctures 1. harpyoides Bradley 



Punctures on frons so distant that they are not angular, and the separating 

 areas are rounded or fiattened ridges ; hind femur beneath with sparse, large, 

 weak punctures 2. thoracica (Blanchard) 



5. Femora black ; lower swelling of mesopleurum with a few moderately large 



punctures (fig. 44, c) 3. reticulata (Say) 



Femora ferruginous ; lower swelling of mesopleurum with many large punc- 

 tures (fig. 44, d) 4. femorata, new species 



