. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 274 bulletin: museum of comparative zoology. equally striking as in the case of P. whcclcri. In collections males of P. crawfordi or P. wheeleri have undoubtedly been confused with those of the above-named species of Fig. 2. Psithyrus crawfordi Franklin, a, basal segments of male flagellum; 6, dorsal aspect of male genitalia. Psithyrus ashtoni (Cresson). In two former papers, the junior author has recorded Bremvs affinis (Cresson) as the host of this Psithyrus (Plath, 1922a, p. 26 and 19226, p. 191). On July
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 274 bulletin: museum of comparative zoology. equally striking as in the case of P. whcclcri. In collections males of P. crawfordi or P. wheeleri have undoubtedly been confused with those of the above-named species of Fig. 2. Psithyrus crawfordi Franklin, a, basal segments of male flagellum; 6, dorsal aspect of male genitalia. Psithyrus ashtoni (Cresson). In two former papers, the junior author has recorded Bremvs affinis (Cresson) as the host of this Psithyrus (Plath, 1922a, p. 26 and 19226, p. 191). On July 15, 1924, a female of P. ashtoni was found living in a colony of Bremus terricola (Kirby), kept in an observation box and consisting of about twenty-five workers, a dozen young queens and several males. This female of P. ashtoni was left unmolested in the colony, a good indication that B. terricola also might be its host; for the junior author has observed on several occasions that, if a female of Psithyrus laboriosus enters a B. terricola colony, it is attacked and killed. Later the association of P. ashtoni with B. terricola was confirmed by the following observation. On August 8, 1924, the junior author found in a plowed field, at Forest Hills, a nest of B. terricola containing three workers, three young females of P. ashtoni, and several P. ashtoni males and females which had died in the cocoons before hatching. Psithyrus suckleyi (Greene). The collection of the Museum of Comparative Zoology contains a male from Umatilla, Oregon, (S. Henshaw Coll.) and two females. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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