AKT. 17. LARVAE OF HOLARCTIC TIGER-BEETLES HAMILTON. 63 



Measurements. — Length of larvae, 10 to 12 mm., width at the third 

 abdominal segment about 1.5 mm.; diameter of ocellus 2, 0.1 1. mm., 

 distance between ocelli 1 and 2, 0.15 mm.; length of fronto-clypeo- 

 labral area, 0.7 mm., width, 0.7 mm. ; length of pronotum, 0.75 mm., 

 width, 1.25 mm. 



Walter Horn, in the Genera Insectorum (fasc. 82, p. 99) states 

 that Konigsberger (1897) discovered the larva in the Botanical 

 Gardens of Buitenzorg (Java) living in the small twigs of the coffee 

 tree. The larva hollows out a cavity in the pith one and one-half 

 as long as the larva itself. The opening to the outside is at a right 

 angle and round about it the twig is somewhat thickened (fig. 190). 

 Walter Horn also states in the Genera Insectorum (fasc. 82, p. 428) 

 that " Keiner der Autoren hat die Larven von C. Bonelli und C. 

 emarginata auseinander halten konnen." Since the larva described 

 by myself came from Horn, I am unable to say whether it is C. 

 honelli or C. emarginata. 



4. Genus (probably) CTENOSTOMA Klug. 



Head with the ridge on the caudal part of the frons slightly sin- 

 uate and continuous with the ridge on the caudal part of the vertex ; 

 arms of the epicranial suture not uniting into a stem but separated 

 by the caudal part of the frons, which reaches to the occipital fora- 

 men; latero-clypeus distinct, crescent-shaped; anterior margin of 

 the labrum smooth; ocelli 1 and 2 subequal in size, ocelli 3 and 4 

 subequal in size, adjacent; ocelli 5 and 6 wanting; antenna sepa- 

 rated from the mandible by a narrow, inconspicuous, transverse bar, 

 the second segment not longer than the other segments combined; 

 maxilla with the ventral sclerite of the cardo triangular and bearing 

 a single setae, lacinia apparently absent, maxillary palpus three- 

 segmented, increasing slightly in length from the proximal to the 

 distal segment, the proximal segment without a spine on the latero- 

 distal margin; labio-stipites without a furrow along the meson but 

 with a distinct ridge or carina along the lateral and caudal margins, 

 ligula not chitinized on the ventral aspect, palpiger area with two 

 chitinized sclerites separated by a flexible suture, labial palpus with 

 the proximal segment longer than the distal segment and with two 

 spinelike projections on its ventro-distal margin, the proximal seg- 

 ment with four or five setae and the distal segment with one; fifth 

 abdominal segment with the inner, median, and lateral hooks pres- 

 ent, the inner hooks short and thornlike, the median hooks somewhat 

 sickle-shaped and pointing outward, the lateral hooks short, thorn- 

 shaped, and produced at the anterior end of a chitinized sclerite 



