Americana 



mi. 11. 



BROOKLYN, MSY, 1886. 



NO, 2. 



On Hemerobius (Psectra) dipterus Bun/i. and 



H. delicatulus A. FUch. 



By Dr. H. A. Hagen. 



Prof, Burmeister first described in 1839, Hdb. II, p. 973, No. i, 

 the interesting Hemerobius dipterus. The specimen collected near Leip- 

 zig, Saxony, by Prof. Schwagrichen in the Museum in Halle, is a male 

 with rudimentary hind wings. A second specimen from the same locality 

 in Prof. Kunze's collection had been destroyed. The description of the 

 venation by Burmeister is detailed. He remarks that this species is re- 

 lated to Hemerobius, similarly as Mantispa notha to Mantispa. I ma\- 

 remark that the abdomen of H. dipterus male, in drv well preserved 

 specimens, has just the same appearance by alternately knotty swellings 

 as 31. notha in Erichson's figure \T, b. 



The first specimen, which I have seen in the Museum at Berlin, in 

 1849, ''^'''^s collected the summer before by Dr. Erichson in the Botanical 

 Garden at Halle. Prof. Burmeister who happened to be present in the 

 Museum, identified this specimen as // dipterus. It is also a male. 

 Walker, Catal. of the Neuropt. Ins. in the Brit. IMuseum, 1852, pt. Ill, 

 p, 298, has only repeated Burmeister's diagnosis. 



Mr. J. C, Dale had collected a male specimen iVoin a ha/.eU)ush 

 outside of Breach Wood, near Langport, Somersetshire, June 26, 1843. 

 The Proc. of the Ent. Soc. London, March 6, 1854, (reprinted Zoologist 

 Vol. XII, p. 4273) first announced this remarkable discovery, and Mr. 

 John Curtis has given in the Trans. Ent. Soc, Ser. 2, vol. Ill, p. 56, a 

 short description of the species. The same specimen is redescribed by 

 R. M'Lachlan, 1866, and figured in his Monogr. British Neur. Plani- 

 pennia. I am not aware of the capture of another specimen in P^ngland. 



The late Mr. Bremi-Wolf in Zurich sent to me the Hemerobidx' 



