ART. 23. BLISTER BEETLE TRICRANIA PARKER AND BOVING. 19 



vestigated by Cros, the hooks are found normal in size and position. 

 In Leptopalpus, Nemognatlia, and Sitarohmchys the tarsal setae, 

 one or two in number, are always weak. 



SECOND LARVAL INSTAR. 



Figs. 7, 8, 14, 26, 27. 



Length immediately after first moult, 2.25 mm.; before second 

 moult, 2.75 mm. Width after first moult, 0.5 mm. ; before second 

 moult, 1.2 mm. 



Color, whitish. All segments soft. 



Setae, none, but body densely set with minute, pointed asperities. 



Body form, in the beginning of the stage rather slender and spin- 

 dle shaped Avith comparatively long legs stretched out like oars, 

 later on distended, more ovate, doi^ally flat and ventrally veiy con- 

 vex (figs. 26, 27). Thoracic segments of about equal length; pro tho- 

 rax mirch narrower than mesothorax and the latter slightly narrower 

 than metathorax. Ten distinct abdominal segments; first to third 

 abdominal segments the largest. Spiracles located on the flat dorsal 

 surface at a short distance in from its lateral margin, freely exposed 

 to the atmosphere and permitting easy and safe breathing. Below 

 the wide overlip fleshy and supple mouth parts work as exquisite 

 tools of the gluttonous larva. 



Head, porrect and extended ; length from free margin of labrum to 

 occipital foramen almost one-eighth of entire body length. Width 

 of head about the same as the length. Form of head, with labrum 

 included, quadrate-rotundate ; anteriorly rounded, sides straight and 

 parallel, posterior corners rounded. Short coUum. Occipital foramen 

 wide, broadly oval and posterior. Dorsal and ventral surfaces of 

 head capsule slightly convex and smooth. * 



Frons (fig. 7), rather distinct, posteriorly rounded, not reaching 

 the occipital foramen. Frons and clypeus fused. 



Labrum, large, immovable but separated from clypeus by a fine 

 line; shaped like an eyeshade, covering the other mouth parts com- 

 pletely. 



Epicranial halves, dorsally meeting along a well-developed epi- 

 cranial suture. 



Antennal foramen, anteriorly continuous with mandibular fora- 

 men; almost circular, diameter about one-fourth the length of the 

 epicranium from mandibular condyle. 



Hypostomal margin between mandibular condyle and posterior 

 end of maxilla (fig. 14), transverse, semicircularly emarginate. 



Margin between end of maxilla and occipital foramen, fused with 

 intermediate gular region. 



Gular region, longitudinal, subrectangular, about three times as 

 long as wide. 



