300 SUMMARY OF CURRENT RESEARCHES RELATING TO 



■of Chironornids correspond to the anterior ostial folds of Ephemerid 

 larvfe. 



On the course of the heart there are areas at which the contraction 

 is strongest, and forms constrictions. The diastolic expansions of the 

 heart are not due to the contractions of the muscles of flight, though 

 they are synchronous with the latter. The fibrils, which extend on the 

 surface of the pericardial septum, are elastic. In the larva of Clo'e, a 

 ventral diaphragm was observed. 



Embiidae and the Morphology of Insects.* — K. W. Verhoeff has 

 made a study of the Embiidas — a family of insects to which relatively 

 little attention has hitherto been paid. He has made the thorax a 

 subject of particular investigation, and finds that, as in Japygidas, it 

 •consists of six segments. The limbs, the head, the nerve cord, the 

 abdomen, and the stigmata, are duly discussed. 



In a synthetic primitive insect, according to Verhoeff, the body was 

 •divided as follows : — 



■ 1. Akron. 



I 2. Antennary segment. 



a tj j vi, • 4. 3. Pre-mandibular segment. 



A. Head with six segments . - . , r ,., , b , 



& I 4. Mandibular segment. 



1 5. Anterior ) .,, , 



1 6. Posterior, "Hilary segments. 



B. Protothorax with two seg-(l. Mikrothorax. 



ments . . .12. Prothorax. 



[1. Stenothorax. 

 C Deuterothorax with four seg- 2. Mesothorax. 

 ments . . . 1 3. Cryptothorax. 



(4. Metathorax. 



D. Proabdomen with fourteen! ~*' ,° ' 



" (l-7. Primitive segments. 



E. Medial abdomen with two 18. Abdominal segment (main segment). 



(or three ?) segments . It). Abdominal main segment. 



1. Cercus segment (10th abdominal 



-d , i ■, .,, - \ main segment). 



Postabdomen with four seg- 1 . ? p yo .jj mm » 



Metapygidium I- Opisthomeres. 

 Telson j 



Verhoeff divides Enderlein's order, Isoptera, into two sub-orders : — 

 A. Termitina, the termites ; and B. Adenopoda (including the single 

 family Embiidae, and the single genus Embia). 



Life-History of Litomastix truncatellus.f — F. Silvestri gives an 

 account of this parasitic Hymenopteron, which lays its eggs in those of 



* Nova Acta Leopold-Carol. Acad. Halle, lxxxii. (1904) received 1906, pp. 145- 

 205 (4 pis.). 



t Ann. Scuola Agricoltura Portici, vi. (1906) pp. 1-51 (5 pis., 13 figs.). 



