- 
voL. Iv.] Description of a Luminous Larva. 129 
anteriorly where it is but little wider than the head. Segments 
three to eight equal in length, each hardly two-thirds length of 
second, very gradually widening to eighth, which is but little 
wider than three; segments nine to twelve a little longer, hardly 
wider than others; thirteen a little longer than twelve, not as 
long as second, a little narrowed and rounded off behind, with a 
segment-like anal joint or appendage which shows very plainly 
on the ventral surface, making the larva appear fourteen-jointed, 
and is doubtless homologous with the so-called anal proleg, 
though it does not appear to possess this function in the present 
case. All the joints except head covered dorsally with fine 
short posteriorly directed bristly hairs, longer and directed more 
outwardly on sides, extending down on lateral ventral surface; 
median ventral surface less distinctly short hairy except on 
thoracic segments. Head bears some bristly very short hairs on 
edges. A moderately large black convex simple eye on outer 
anterior edge of head, rather prominent, partially hidden by the 
head being retracted within the overlapping anterior dorsum of 
prothorax. Antenne short, situated just anterior to and inside 
_ of eyes; basal joint stout and rather tubercular, second joint 
smaller, about as wide at base as long, subconical, bearing some 
bristly hairs; third joint minute, as long as broad, terminated 
by a few short hairs. Mandibles apparently single-toothed, 
blackish, curved, and rather claw-like, not stout. Maxille two- 
- jointed, stout, the joints rather cylindrical; second joint as long 
as wide, but narrower than the basal. Maxillary palpi small, 
apparently two-jointed, the second joint but little smaller than 
the basal. Labial palpi very small, slender, two-jointed, the 
joints short and subequal; an anterior prolongation of the labium 
between them surmounted by two fine hairs. Prothoracic 
segment deeply notched anteriorly below with a V-like fold of 
the integument extending not quite to its posterior margin, 
exposing what seems to be a separate sclerite belonging to the 
prothoracic segment. Spiracles situated about middle of lateral 
edges of segments five to twelve inclusive, but appearing © 
anterior to middle when the segment is retracted. Legs appar- 
ently four-jointed, basal joint elongate, appearing as a prolonga- 
tion of the integument; second joint short, about one-half 
