244 NEW YORK STATE MUSEUM 



The nymphs found in Little Clear creek, where most abun- 

 •dant, were often deeply incrusted with a reddish brown 

 deposit, and in July many of them were further decorated with 

 a number of living red hydras attached to their backs, as shown 

 -on plate 13, figure 5. 



Argia tibialis Rambur 

 Plate 15, a 

 1842 Platycnemis tibialis Rambur, Ins. Neur. p,241 

 1861 Trichonemis tibialis Hagen, Sj'nopsis Neur. N. Am. p. 72 

 18G5 Argia tibialis Selys, Acad. Belg. Bui. (2) 20:413 

 1893 Argia tibialis Calvert, Am, Ent. Soc. Traus. 20:233 



This species is not yet known from New York State, but it has 

 l>een reported from Pennsylvania, and may be found here also. 

 Its range extends westward and southward to Illinois and 

 Texas. I have a number of specimens that were bred by Mr 

 F. G. Schaupp at Shovel Mount Tex., between Aug. 13 and Aug. 

 18, 1898. From the cast skins, and from a few additional speci- 

 mens apparently belonging to the same species, I have drawn 

 the following brief descriptive characters. 



Nymph. Length 12mm, gills 4.5mm additional, abdomen 8mm; 

 width of head 3.2mm, Color greenish or brownish, marked with 

 •darker in a double row of elongate spots on the dorsum of the 

 abdomen, and in two faint transverse bands on each femur. 

 Structurally it differs from the preceding species only in the 

 following points: there are four lateral setae on the labium, in 

 a regular series; the end hook of the lateral lobe is not sepa- 

 rated from the inner margin by an incision; the tooth on the end 

 above the end hook is smooth and not denticulated superiorly; 

 the gills are ovoid oblong, widest just beyond the middle and 

 rather abruptly rounded on the tip, and they show hardly any 

 area of lighter color apically. Antennae six jointed; other char- 

 acters as in the preceding. 



Argia bipunctulata Hagen 



1861 Agrion bipunctulatum Hagen, Synopsis Neur. N. Am. p. 90 

 1865 Argia bipunctulata Selys, Acad. Belg, Bui. (2) 20:415 

 1893 Argia bipunctulata Calvert, Am. Ent. Soc. Trans. 20:234 



This species is recorded from New Jersey, but is not yet 



known from New York State. Its nymph is still unknown. 



