. Brigham Young University science bulletin. Biology -- Periodicals. 38 Bricham Young Univeksit^- Science Bulletin Larvae Body: idiosomal form essentiallv oval for all species. Both length and width variable. D. iilbipictus is the most broad (sub- circular). D. jHiruiiuipertus has the greatest mean width and D. occiileulalis has the nar- rowest. The posterolateral margins are distinctly rounded in all species. Four pairs of sensilla sagittiformia are pres- ent, one pair jX)sterior to each coxal plate (Ssag not shown on fig. 4 [X)Stcrior to 1st plate), and one dorsolateral pair
. Brigham Young University science bulletin. Biology -- Periodicals. 38 Bricham Young Univeksit^- Science Bulletin Larvae Body: idiosomal form essentiallv oval for all species. Both length and width variable. D. iilbipictus is the most broad (sub- circular). D. jHiruiiuipertus has the greatest mean width and D. occiileulalis has the nar- rowest. The posterolateral margins are distinctly rounded in all species. Four pairs of sensilla sagittiformia are pres- ent, one pair jX)sterior to each coxal plate (Ssag not shown on fig. 4 [X)Stcrior to 1st plate), and one dorsolateral pair on the opisthosoma. Due to their constant position they are of taxo- nomic value at least at the generic level. Various other sensillae were seen and studied. For exam- ple, sensilla haustiformia were observed on the scutum, postscutum, basis capituli, palps, and leg segments. Dermal sensilla, sensilla porosa, and the scutal sensillae are sensilla haustiformia according to Dinnink and Zumpt (1949). Nev- ertheless, onlv those sensillae observed on the palps, basis capituli and scutum are included in the drawings in this study. Further study on the comparative position of the sensilla hausti- formia is needed to more fully determine tlieir taxonomic utility at the species level. The general arrangement of setae is rela- tively constant in all species studied. Tliis is in agreement with Clifford and Anastos (1960). Because enough other characteristics are pre- sent to use for identification pur|X)ses, chae- totaxy was not emphasized. Capitulum: D. alhipictus has the niyrowest basis capituli. Its lateral projections do not extend beyond the apex of the scapula. All other species in this study have distinct lateral points, extending beyond the scapular apex. The lateral points of D. halli are more tapered than in other species. The posterodorsal margin of the basis capituli and the lateral points are best obsersetl on unmounted specimens. Tlie capitulum naturally projects shghtly do
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