. Smithsonian miscellaneous collections. gure 37. The morestriking dififerences in the larval head are found in the presence ofa clearly defined front, clypeus, labrum, and a well developed sub-mentum. Epicranial suture.—The sutura metopica as well as the suturafronto-verticale are well developed and doulile lined (a, b). They arenot raised or padded as in the adults. Front.—The front (fig. 37. Fr) is triangular in outline, plano-con-vex and clearly defined by the epicranial suture. The lateral sides arebordered with six strong bristles each (d). These setae are herecalled setae fronto-lateral
. Smithsonian miscellaneous collections. gure 37. The morestriking dififerences in the larval head are found in the presence ofa clearly defined front, clypeus, labrum, and a well developed sub-mentum. Epicranial suture.—The sutura metopica as well as the suturafronto-verticale are well developed and doulile lined (a, b). They arenot raised or padded as in the adults. Front.—The front (fig. 37. Fr) is triangular in outline, plano-con-vex and clearly defined by the epicranial suture. The lateral sides arebordered with six strong bristles each (d). These setae are herecalled setae fronto-lateralis. The base of the front is smooth withoutany armation. In the discussion of the larval setae it seems to be very useful tocompare the results obtained with those of other authors. From the NO. lO MORPHOLOGY OF GNATHOTRICHUS SCHEDL 71 literature available, only two species have been found to be studiedat the present. These are Dcudroctonus zalcus Lee., investigated byHopkins, and Chacfopfcliiis zcstitiis Fuchs studied by Russo. The. Cl-x Eph/-Lar Hst
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