28 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.75 



MONOXIA CONSPUTA LeConte 



(U. S. Nat. Mus. ; described from larva in vial marked: "Hubbard Note 

 No. 636, Monoxia consputa ( ?) 4th July, 1891, Syracuse Salt Vats, Great 

 Salt Lake, Utah." Not reared. An imago of the species is placed by 

 Hubbard in the vial together with three larvae. No other larval material 

 of this species is preserved in the Museum, but Mr. Hubbard's veell 

 known disinclination to name a larva when it was not reared or fairly 

 well associated with imago warrants the probable correctness of the de- 

 termination. Moreover the Monoxia consputa larva is the only known 

 mining galerucine larva and the specimens in question are without doubt 

 galerucine larvae and adapted to mining in soft plant tissue.) 



Mature larva (fig. 9). — About 6 mm. long. 



Head moderately shining, grayish yellow with blackish colored 

 margins and blackish epicranial midline; labrum grayish. Body 

 light gray, membranous parts predominate; prothoracic shield light 

 amber colored anteriorly and on the top of a posterior transverse, 

 rounded crest; pygidial ghield slightly amber; rest of the sclerites 

 of the body very thin, gray, like the skin, and to be seen only by close 

 examination; legs shining, light amber, with darker margins at the 

 ends of each joint ; claws amber. 



Setae in general minute ; viewed under considerable magnification 

 (figs. 8, 52), short and club shaped. Pointed and either moderately 

 long or short setae present on the head, shields, legs, and epipleural 

 lobes. 



Head capsuU (fig. 40). — ^With hind corners of epicranium 

 strongly produced posteriorly. Frons small, almost hexagonal, in- 

 wardly strengthened in the middle line by a dark colored, Y-shaped 

 thickening. 



Labrum (fig. 41). — Transversely oblong, about two and one-half 

 limes as wide as long, front margin straight; discal setae pointed, 

 moderately long ; marginal setae short and pointed. 



Mandible (fig. 51). — Provided with five claw-shaped teeth; the sec- 

 ond and third larger; first, fourth, and fifth all distinct and rather 

 strong; inner edge of mandible immediately behind the last tooth 

 produced into a small, triangular, anterior projection. Penicillus 

 well developed ; no setae found on the back of the mandible. 



Maxilla (fig. 65). — ^With lacinia and galea carrying short, small 

 lanceolate setae; tactile appendix of galea small. Maxillary palpus 

 three jointed. 



Postlahial band. — Broadly U-shaped, with a slight enlargement of 

 the chitin in the middle. 



Prothorax (fig. 9). — The prothoracic shield rather bulging and 

 divided by a median transverse groove into two slightly chitinized 

 portions ; a few either short or moderately long, pointed setae present 

 in the anterior and the posterior margins. 



