164 Mr. R. McLachlan on 
present and again no filaments. In examples taken in 
July, 1893, by Prof. Klapalek at Dragalevci, Bulgaria, 
there is again the constriction but no filaments. These 
latter specimens are slightly larger. No mention of either 
constriction or filaments is made by Rambur, Costa, and 
Hagen in prior descriptions. Are these filaments fuga- 
cious, or are they extensile and retractile? Here is a 
poimt to be solved! If there be more than one species 
here mixed, the characters must be difficult to define. I 
may mention that one specimen from Buigaria is evidently 
?, and has a somewhat acuminate ovipositor (or case for 
such) at the ventral apex of the abdomen. The habits are 
probably aquatic, unless the fact of the four specimens 
found by Eaton having been all taken near streams is 
only incidental. 
Micromus aphidivorus, Schrk. 
Hab. Constantine, 20th May, 1895, one example. 
Hemerobius parvulus, Rbr. 2 
Hab. In the forest near Azazga by beating Quercus 
suber, 30th August, 2nd and 20th September, 1893, four 
examples. 
Rambur’s Macropalpus parvulus from the island of 
Sardinia has never been thoroughly understood. The 
species I identify with it (with some doubt) is the same as 
the parvulus of Costa according to a type. It is smaller 
and paler than elegans, Steph. (of which pygmeus, Rbr., is 
usually considered a synonym), and the wings are less 
strongly mottled. Yet in some respects the description of 
pygmexus reads as if that should be the smaller. I received 
examples from M. Jules Lichtenstein of Montpellier, who 
bred them from larvee found in the galls of Tetraneura 
ulmi and Pemphigus bursarius. In the Algerian examples 
the markings of the anterior wings are more crowded on 
the apical and inner margins, and form distinct fasciz on 
the rows of discal nervules, without markings between the 
fascize. I consider it as undecided whether the forms set 
down as parvulus may be only a small pale southern race 
of elegans, and also whether Rambur’s parvuluws and 
pygmexus may be only racial forms of the same species 
(elegans). It is most unfortunate that Rambur seldom 
gave any exact measurements in his descriptions, but 
contented himself with comparisons only. 
