152 THE CANADIAN ENTOMOLOGIST. 



have chosen the name of the genus for this character, though I am not 

 aware that he ever had mentioned it ; the derivation is given in Agassiz 

 Nomenclator. The other species have the spurs subuHform, more or less 

 incurvated. This character is indeed very obvious, and so it has been 

 several times stated that probably the species with subuliform spurs could 

 form a different genus. Mr. Redtenbacher, 1884, remarks that I had not 

 stated whether the larva of A. fallax had bristles between the teeth of the 

 mandibles or not. Now A. fallax has no bristles, and therefore they 

 were not mentioned by me. PJut I was not then aware of the importance 

 of this character, otherwise I should have mentioned their absence. The 

 splendid figures of all my larvre drawn by Mr. Konopicki, Vienna, I have 

 not yet been able to publish. 



The question whether Acaiithaclisis has to be divided or not, was 

 studied by me carefully. The previous stages of Americana, the first 

 species known with unbroken spurs, except for the entire absence of bristles 

 between the teeth of the mandibles, seem not to favor a division. I am 

 until now not able to find differences in the characters, except the 

 negative one in the larva, and the positive one in the imago. But I think 

 in Chrysopa and its allied forms similar differences exist. The third N. 

 American species, my A. congener, has broken spurs similar to those of 

 occitanica, and my presumed larva (Mr. Redtenbacher supposes it to be- 

 long to Macronemurus) has bristles on the inner margin of the mandibles. 



Mr. McLachlan, Ent. M. Mag., vol. xx., p. 183, says of ^. occitanica: 

 " Introduced in Prussia." If his statement is not based on new facts or 

 observations unknown to me, I believe that a perusal of the statements 

 given in Stett. Ent. Zeit., vol. xix., p. 124, and vol. xx., p. 431, will not 

 warrant us to consider the species as introduced in Prussia. It is true 

 that the species found through seven years in Kahlberg, Prussia, is not 

 recorded for the whole region between Prussia and Hungary, or beyond 

 the Alps. But I may remark that A. Americana is not recorded for the 

 larger distance from Sandy Hook, New York, to the south of N. Carolina. 

 It is believed that a number of insects of the southern species, even of 

 Florida, are to be found in S. Massachusetts, Marthcl's Vineyard, Nan- 

 tucket, as a consequence of the warmer temperature of the Gulf Stream ; 

 I am assured of the same fact for Sandy Hook. There is perhaps another 

 explanation of the fact that A. Americana has not been yet discovered 

 between New York and N. Carolina. Those large AcantJiaclisis belong 

 to the most sluggish insects known. For the European species I can 



