20 PEOCEEDINGS OF THE NATIONAL MUSEUM. vol.64. 



Optic spot, horizontal, dorso-lateral, blackish pigmented and reni- 

 form; length about equal to diameter of antenna! foramen; ocelli 

 not distinguishable by the presence of lenticular convexities. 



Antenna, thick and conical, about one-eighth the length of head, 

 distal end not reaching middle of mandible, three jointed with basal 

 membrane well developed ; basal joint cylindrical, about half as long 

 as wide, diameter about three times as long as diameter of mandibu- 

 lar condyle; second joint cylindrical, about half as wide as basal 

 joint, somewhat shorter than wide; supplementary appendix very 

 small; a few sensorial papillae; apical joint papilliform, pointed, as 

 long as second joint and one-fifth as wide; no macrochaeta. 



Mandible, rather soft, almost equilateral, triangular, length and 

 width about equal. The exterior side-margin half as long as head 

 from mandibular condyle to occipital foramen: axis between dorsal 

 and ventral articulations approximately perpendicular to the length 

 of the body, hence mandibles operate horizontally; tenninal third 

 part of mandible slightly set off from the rest, with inner margin 

 obliquely truncate, somewhat concave, and minutely serrate; rest 

 of mandible flat, broad, without molar portion or any other par- 

 ticular structures. 



Maxilla, free, protracted, fleshy, subcylindrical, twice as long as 

 wide, palpus not counted. Stipes indistinctly divided into a distal 

 and a proximal part of equal size.^ Cardo absent, or more probably 

 fused with the proximal part of stipes. Mala single, low and in- 

 distinct, fleshy and without spines or long setae. Palpus three 

 jointed, short, one-fourth the length of the entire stipes, thick and 

 conical; the joints are in shape and proportion similar to the 

 antenna! joints. 



Mentum (possibly including submentum) and Stipites labii. fused 

 into a free, thick, fleshy, subcylindrical organ which acts like a 

 spoon; it is twice as long as wide, and as long and one-fourth as 

 wide as one of the stipites maxillae. 



Labial palp, two jointed, same 'size as the two combined terminal 

 joints of the maxillary palp. 



Ligula, indistinct. 



Paragnathae (=Maxillulae=Paraglossae), not developed. 



Hypopharynx as well as the anterior portion of the floor of the 

 buccal cavity, fleshy, soft and covered with fine pubescence. 



8 An iuterpretation of these maxillary components as being stipes and cardo mislit be 

 possible. Such an Interpretation, however, does not present itself as quite so valid as 

 the one given above because it does not concur with the maxillary development in the 

 first instars of Meloid larvae of the more unchanged types, like Zonahrts. Neither would 

 it agree with the interpretation given below of the maxillary parts in the third and fourth 

 stages. Briefly expressed, the maxilla of the second instar of a Meloid larva seems more 

 comparable to the maxilla of a Carabid larva as Amarn, than to the maxilla of a 

 Staphylinid larva like Philonthtia or Oojpus. 



