IQ ARKIV FÖR ZOOLOGI. BAND 5. NIO 12. 



prothorax. Besides these there are numerous small perpen- 

 dicular hairs botli on the prothorax and the head. 



On the elytra we notice about 8 pairs of comparatively 

 short, black hairs, and a dense row of small perpendicular 

 hairs at the anterior margin. 



On the abdomen we find nearly the same arrangement 

 and number of hairs as in the larval stages, only there are 

 no tubercles and the hairs appear to be glandular no more. 



At the top of the abdomen there is a pair of finger- 

 shaped appendages, curved slightly inward and shghtly con- 

 stricted at the top (Fig. 6. Pl. I); near the base at the 

 median edge and subventrally they are provided with a pair 

 of sucker-shaped appendages and bear numerous small spinulee, 

 arranged in transverse groups of 3—4 and directed forwards, 

 thus acting as hooks. 



Two features seem to me to be of special interest in the 

 organisation and development of Cl. arcuatus: firstly that 

 the glandular hairs, which it possesses alone of all known 

 larv£e of the Scymnidse, is a characteristic which it shares with 

 the immature stages of Äleyrodes Phillyrea Haltd., on which 

 it feeds; secondly, that the dorsal glandular hairs are most 

 highly developed in the P* larval stage, during which there 

 are no other glandular hairs, and that they låter diminish 

 in size at the same time as the other glandular hairs appear. 



Data regarding the metamorphosis. 



. 28. III. 1 egggtage at least 8 clays 

 6. IV. J 



Egg found . 

 hatched . . 

 became inert. 

 changed skin 

 became inert 

 changed skin 

 became inert. 

 changed skin 



left the leaf and attachedl 

 itself to the glasstubej 



Pupa 7. V, 



Adult 15. V 



■ ■ \ ist larval stage 8 days (inert 1 day) 

 4 days (inert 1 day) 



18. IV. 1 ^ 



ig.iv.P'^'^^^^^ 



. 22. IV. 

 . 25. IV. 



Si-d stage 6 days (inert 3 days) 



12 days (inert 4 days) 

 stage 8 days 



3. V. r 4tli stage 



I pupal 



Total (at least) 48 days. 



Taking for granted, that the data given above are per- 

 fectly typical, it is noteworthy: firstly, that both the 2^'^ and 



