128 Journal New York Entomological Society, t^'oi- -^-"^iv, 



in a specimen collected on the laboratory window of the department 

 of entomology at the University of Nebraska, May ii, 1901. This 

 specimen was not infesting a heron, but either a mourning dove 

 {Zcnaidura macroura margincUa) or one of six species of shore 

 birds, fresh specimens of all of which were in the room at the time. 

 These shore birds were the semipalmated plover {Mgialitis semi pal - 

 mata), golden plover {Charadrius dominicus doniinicus) , Hudsonian 

 godwit {Liniosa hccniastica) , white-rumped sandpiper (Pisobia fiisci- 

 collis), red-backed sandpiper {Pelidna alpina sakhalina) and semi- 

 palmated sandpiper {Ereunetcs pusillus). 



The European O. ardccc Macquart has been recorded by Loew 

 from " North America," and by J. B. Smith from New Jersey on 

 the little blue heron ( Pblack-crowned) night heron and bittern, and 

 is the only other North American species recorded from a heron. 

 The larger size (6 mm.), dusky wings and shining black coloration 

 described for ardccc indicates entire distinctness from albipcnnis. 



2. Olfersia botaurinorum new species. 



Very similar to O. albipennis Say, above redescribed, but distinctly larger, 

 the length of the head and thorax measuring 3.25 mm., the width of the 

 thorax at its widest part 2.5 mm., and the distance from the front of the head 

 to the tip of the wing 8 mm. Color of head and thorax darker, more blackish, 

 the color of the humeral processes not distinctly paler than that of the rest 

 of the thorax above. Head less broad, one and one fourth times as wide as 

 long, the apical section of the clypeus comparatively narrow at base and 

 rather deeply eniarginate at apex, so that the visible basal width along the 

 dividing sulcation is not more than one third of the distance across the 

 emargination between the lateral apices. Antennary processes black and bear- 

 ing much black hair. Face without obvious hair along orbital margins and 

 mesonotum likewise not hairy. Wings faintly clouded. First vein joining 

 the costa considerably before the first crossvein. Otherwise agreeing with the 

 preceding description of O. albipennis. 



Type. — Omaha, Nebraska. May 26, 1907, on a least bittern (Ixo- 

 hrychiis exilis) by R. H. Wolcott. 



Paratypcs. — Type lot, i specimen; Lincoln, Nebraska, April 21, 

 1901, on a bittern (Botaiirus Icntiginosiis) by J. C. Crawford. 



It is possible that this form is conspecific with A. ardccc Macquart, 

 but after a careful comparison with the description I have decided 

 to let it stand as distinct. Certainly the wings are not as dark as 

 described for ardccc. The specific name is from the subfamily to 

 which the bitterns belong. 



