. A year of Costa Rican natural history. parts of the head—the labrum(or upper lip) and the nasus—which were pale blue. Aspecies which I lost in this same piece of woods this day,a Philogenia, had only one or two segments of the hind endof the abdomen pale colored, like the whitish bloomsometimes seen on a plum; all the rest of the body was darkand the insect kept to the shadows so closely that it wasvery difficult to see. Some writers, like Mr. E. B. Williamson, have suggestedthat these more conspicuous pale areas on dark bodies ofdragonflies (not necessarily those confined to dark woods)serv
. A year of Costa Rican natural history. parts of the head—the labrum(or upper lip) and the nasus—which were pale blue. Aspecies which I lost in this same piece of woods this day,a Philogenia, had only one or two segments of the hind endof the abdomen pale colored, like the whitish bloomsometimes seen on a plum; all the rest of the body was darkand the insect kept to the shadows so closely that it wasvery difficult to see. Some writers, like Mr. E. B. Williamson, have suggestedthat these more conspicuous pale areas on dark bodies ofdragonflies (not necessarily those confined to dark woods)serve as recognition-marks to the other sex. I naturally looked for additional specimens of the newgenus and of the Palcemnema, but unsuccessfully, until theincreasing cloudiness warned me to seek shelter before thebeginning of the usual heavy afternoon rain. Search forthem was in vain on the following morning also, when Iattempted a grassy road which led up from the laguna Intothe woods, and which I finally gave up because of the deep. H 1^ \
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1917
