armatures in the Hymenopterous f/enus Golldes. 37 



related.) Certain dififerences of pilosity {e.g. nearly naked 

 or, on the contrary, almost villose discs of the abdominal 

 segments) are perhaps of real phyletic significance, but 

 all sorts of intermediate conditions occur, and I prefer as 

 far as possible to employ characters which depend less 

 on the freshness, etc. of the particular specimens ex- 

 amined. As to my measurements of antenna, legs, gence, 

 etc., I have made them with great care ; but I cannot 

 hope that I have always avoided errors, for when such 

 objects are measured microscopically, the slightest in- 

 accuracy in placing them produces a fallacious image, and 

 falsifies the measurement accordingly. 



TABLE OF EXTERNAL CHARACTERS. 



1. Gense extremely long, their (least) longitudinal 



diameter quite twice the hreadth of the 



mandible at its base ... ... ... ... ... 2. 



Genae evidently elongate, but decidedly not 



twice as long as the base of the mandible is 



broad ... ... .. ... ... ... ... 3. 



Genre subquadrate, their (least) length about 



equalling the breadth of the mandible ... ... 5. 



Gense transverse or short, two-thirds as long as 



the breadth of the mandible or less ... ... ... 15. 



(For the above characters, consult the Figures 



of genpe and heads in Plates VI and IX.) 



2. Abdomen coarsely and rugosely punctured. 



Face, between eyes, very long, narrow and 



parallel-sided. (PL IX, 36) 15. )wsf/i«s, Smith. 



Abdomen with minute distinct punctures. Face 

 very long, but wide above, the eyes con- 

 verging. (PI. IX, 39) 34. formoms, Perez (? = 



lacunatus, Dours). 



3. Abdominal fasciie definite and conspicuous 4. 



Fascise indefinite or absent. Large, circ. 15 



mill, long 33. cuniculariiis, Linn. 



4. Second abdominal segment clothed on its disc 



above with long pale hairs. All the fascise 

 wide. Species rather small, circ. 10 mill. 



long 16. coriandrifTerez. 



Disc of second abdominal segment with short 

 fuscous hairs. Fasci;e towards the apex of 

 the abdomen becoming very narrow. A much 

 larger species than the last, circ. 13 mill, 

 long. Cordiform area of the propodeum 

 with a narrow shining triangle forming its 

 apex, but its base and disc occupied by a 

 series of transverse parallel rugosities (Can- 

 ary Islauds, etc.) 5. dimidiatus,Brul]e. 



5. Sixth ventral plate with a well-defined small 



and deep oval fovea, impressed transversely 

 on each side of its disc, some way from the 

 sides and apex of the segment. (PI. IV, 52) ... 6. 

 Sixth ventral plate without such definite discal 

 foveas, though sometimes broadly depressed 

 or excavated on each side of a central carina. 

 (Cf. PI. IX, 53) 7. 



