32 THE CANADIAN ENTOMOLOGIST 



1st abdominal ganglion, and with the median line very heavily impressed. 

 Those of the 7th abdominal segment are distinctly separated on both the cephalic 

 and caudal thirds of their length. The last ganglionic mass, in the 7th seg- 

 ment, is in the form of two distinct ganglia, the last, or 8th, being separated 

 from the 7th by extremely short but evident connectives. 



TropcBa lima L. 

 Plate II, Figs. 3 and 4. 



The connectives of the 1st thoracic segment are extremely short; the abdo- 

 minal connectives are impressed along the middle line, and the thoracic con- 

 nectives are fused for a short distance behind the 1st and 2nd thoracic ganglia. 



Eacles imperialis Drury. 



The connectives are widely separated between the suboesophageal and the 

 first thoracic ganglia, widely separated on the caudal half only and adjacent 

 in front in the 2nd and 3rd thoracic segments. In the abdomen the connectives 

 are slender and completely fused except for a narrow but complete separation 

 for a short distance in front of the ganglia. The median line can rarely be 

 traced throughout the length in the abdominal connectiyes. This condition 

 is in sharp contrast to that found in the Sphingida,'. The last ganglion is very 

 elongate but only feebly constricted at the middle. The median nerve in the 

 2nd and 3rd thoracic segments is extremely complex. 



Schiziira concinna S. and A. 

 In Schiztira the connectives between the suba^sophageal and the 1st thoracic 

 ganglion are short, hardly longer than the 1st thoracic, but separate and ap- 

 parently without nerves; these latter appear to arise from the 1st ganglion. 

 The connectives between the 1st and 2nd thoracic ganglia are united for the 

 cephalic half and widely separated on the caudal half, with the usual nerve 

 from each side and the oblique muscles emerging between the connectives. 

 The median nerve of this segment is well developed and branches about one- 

 third the distance in front of the 2nd thoracic. The connectives between the 

 2nd and 3rd thoracic ganglia are widely separated for the entire length, and the 

 median nerves separate about one-third the distance behind the 2nd ganglion. 

 The connectives of the abdominal segments are united, although the median 

 line of union is visible and the two are distinct immediately cephalad of each 

 ganglion. The last two ganglia are closely connected, without visible con- 

 nectives, but recognizable as two ganglia. 



Datana ministra Drury. 

 . The connectives between the suboesophageal and the first thoracic ganglion 

 are distinctly separated and slightly longer than the first ganglion. The next 

 pair of connectives are separated, except for the cephalic eighth or less, and dis- 

 tinctly separated behind at their insertion ; the connective nerves arise very close 

 to the ganglion, less than one-half its diameter from it, and the median nerve 

 branches about midway between the ganglia. The connectives in the 3rd 

 thoracic segment are similar, but with the lateral nerves still closer to the ganglia 

 and the median nerve considerably shorter. The connectives of the 1st 

 abdominal segment are shorter, and divided for the caudal half of their length. 

 The remaining abdominal connectives are fused completely, except for the 

 median split in the caudal fifth. The last pair are shorter and divided for 



