r^ 



STG 



PI 



PB 



.,CBV 



B 



Fig. 5.— Diagrammatic sagittal section through the brains of A, a scutigero- 

 morph (modified, after Fahlander, p. 57- fig- 23), and B, Arenophilus bipunc- 

 ticeps (Wood). Homologies are represented by the same shading patterns, ihe 

 antennal lobes, separated in the scutigeromorph (see fig. 4, A), do not appearin 

 section. The central complex (CC) is lacking in biptincttceps. The anterior 

 (ADC) and posterior (PDC) commissures of the deutocerebrum are not sep- 

 arate entities in bipuncticeps but represented as fused (DC). Note that the 

 frontal ganglion and stomatogastric ganglion are separated from the central 

 neural mass in A, and indicated only by STG in B. (See text for explanation of 



broken arrows.) 



27 



