THAXTER. — ARGENTTINE LABOULBFNIALES. 221 



Plata by P. Spegazzini, and also on the legs of G. Lacordairii, No. 

 1428, in the Museo Nacional. It resembles the type form from Vene- 

 zuela in that the basal cell of the outer appendage is similarly modified 

 but lacks the constriction, so characteristic in the type, above the 

 basal cell of the receptacle. In the latter respect it approaches more 

 nearly the distinctly larger Brazilian specimens obtained on G. 

 carbonaria, in which, however, the basal cell of the outer appendage 

 is unlike that of the type. 



Laboulbenia Brachini Th. was again obtained abundantly from 

 various species of Brachinus, and from different regions in the Argen- 

 tine. 



Laboulbenia Clivinae Th. on Clivina sp. and entirely typical was 

 found on a specimen in the Museo Nacional, No. 1430, "Argentina." 



Laboulbenia compada Th., was found but twice on Bembidia outside 

 the docks at Buenos Aires, No. 1969 and 1967. 



Laboulbenia cristata Th. was found but once on Paederus sp., No. 

 2029 La Plata. 



Laboulbenia geniculata Th. Several specimens of this species, which 

 correspond exactly to the type, were obtained with several other 

 species on a black Galerita collected at La Plata by P. Spegazzini. 



Laboidhenia decipiens Th. was found on a black Galerita, No. 1439, 

 from Tucuman, in the Museo Nacional. 



Laboulbenia Mexicana Th. a pale and variable species, usually found 

 only on the mid-elytra, occurred on two species of Galerita, Nos. 

 2020 and 2021 from La Plata, and Llavallol; also on a species from the 

 Pampa Grenada, No. 1442 and from Jujuy, No. 1445, both in the 

 Museo Nacional. 



Laboulbenia Oedodactyli Th. was found repeatedly on Oedodadylus 

 fuscobrunneus Fairm. No. 1976, at Llavallol and at Temperley. The 

 material is in good condition and in a majority of individuals the 

 outer appendage is greatly elongated, almost as much so as in L. 

 Lathropini, which is its nearest ally, but from which it is distinguished 

 at once by the character of its wall-cells which are neither striate nor 

 spirally twisted. 



Laboulbenia pedicillata Th., occurred rather rarely on Bembidium 

 at Buenos Aires. No. 2016. 



Laboulbenia Philonthi Th. was very common on various species of 

 Philonthus throughout the whole Buenos Aires region. 



Lcdjoulbenia polyphaga Th. The forms allied to this species and to 

 L. flagellata were numerous on many genera of Carabi(Jae. The whole 

 series needs much careful study of abundant material. Nos. 1506, 



