NO. 1371. NE W DRA aON-FL Y .V YMl'lllS—yEEDHAM. 705 



ment 10 one-luilf iis wide a.s 9, which, with the iil)l»i-eviiit<Ml appeiid- 

 ag'e.s, gives tlie al)cloiiieii a truncate appearance. 



I am wholly unahh^ to locate these nymphs ocnericallv. There is 

 no venation to guide, and they are immature. They will l>e found 

 to l)clong\ however, to some geiuis allied to Orfhefruiii. with which 

 they agree in all points except the structures of the apical abdominal 

 segments, the ])revity of the abdominal appcMidages. etc. 



LIBELLULA SATURATA Uhler. 

 riatf XLII, \v^. 1. 



Prof. Y. L. Kellogg has kindly sent me a bred specimen of this 

 species from Stanford University collection (lot 148, sub. 20), and I 

 have a number of nymphs kindly collected for me by Dr. John M. 

 Stowell at San Jose. California, in Februar3', These latter, dated 

 April, 1897, are ""from water cress in running water." 



This species is distinguished among its congeners by its hairiness, its 

 lack of dorsal hooks, and especiallv by the unusual })revity of the 

 lateral spines of the ninth abdominal segment. 



Length, 26 mm.; abdomen, 16 mm.; hind fenuir. ♦>..5 mm.: width of 

 head, 6.5 mm.; of abdomen, S mm. 



Body stout, depressed cylindric, with squtirish head and tapering 

 abdomen. Head of the usual form, A^ery hairy on the hind angles. 

 Antenntv with basal segments very hairy, the ratio of length of seg- 

 ments from the base outward being as 1:1.1:2:1.2:1.6:2:2. There is 

 a transverse blackish band between the ej'es, inclosing a paler spot on 

 the frontal tubercle. The labium is large, with its hinge reaching 

 posteriorly as far as the mehithorax. The median lobe of the mentuni 

 is rather less prominent than usual, with smooth border and no middle 

 tooth bearing regularW placed spinules. Lateral settv 11-12, the six 

 outermost in a longer series. Lateral lobes broad, concave, each with 

 9-10 lateral seta? and a))Out ten low, crenate teeth with eroded sum- 

 mits on the opposed borders, each armed with 3-4 graduated s])inules. 



Thorax blackish on the dorsum, darker around the spiracles, and 

 before the bases of the wings. Legs yellowish, hairy. Wings reach- 

 ing the seventh abdominal segment. 



Abdomen with a single middorsal and a pair of obscur(> lateral longi- 

 tudinal lines; the dorsum of the tenth segment and tlu^ siiles of the 

 appendages blackish. Dorsal hooks wanting. Lateral spines on seg- 

 ments 8 and 9 about one-eighth as long as their respective segments, 

 that of 9 a very little shorter than that of 8. Segment 9 concave on 

 its dorsal apical margin; lo annular, and almost included in the apex of 

 9. Appendages as long as segments 9 and 10 together, the superiors 

 and inferiors equal, spinous margined; the laterals about half as long. 



A later sending of a few alcoholic nym])hs, received by the National 

 Museum from the United States Fish Commission, includes several 



