15G [J"iy. 



GoMPHUS LucASiT, Selja.— Constantinc, end o£ May aud first 

 half of June, two (^ , three $ . 



Sub-fam. .ESCHNINtE. 



Anax roEMOSUS, v. d. L.— Medea, pond W. of Oued Gargua, 

 about 2000 feet, July 5th, 1893 ; Biskra, April 14th, 1894 ; Lac Hou- 

 beira, July 3rd, 1890. 



tEschna CYAj!ficA, Milll., variety (or aberration ?). — Azazga, Sep- 

 tember 13th, 1893, one S- 



This example is in several respects aberrant. On the face the nasus is wholly 

 fuliginous, except at the sides ; the black T-spot on the top of the front has its head 

 exti'etnely broad : the principal triangles are symmetrically four-celled in the an- 

 terior wings and three-celled in the posterior, in each case the horizontal nervule 

 dividing the first cellule being absent : the anal triangle in the posterior wings is 

 symmetrically only two-celled, owing to the absence of the perpendicular nervule 

 dividing the upper half. The spots on the thorax above are reduced in size. But 

 in the markings of the abdomen, and in anal structure, it is absolutely typical. 



tEschna affinis, v. d. L. — Ain Kriar and La Calle in June, 

 common. 



^SCHNA EUFESCENS, V. d. L. — Ain Kriar, June 20th, 1896, 

 common. 



Sub-fam. CALOPTERYGIN^. 



Caloptertx HiEMOERnoiDALTS, v. d. L. — A few examples, Biskra, 

 May, 1894 ; Constantino, May, 1895 ; Le Tarf and Lac Houbeira, 

 July, 1896. 



Caloptertx exul, Selys. — About a dozen examples of this sin- 

 gular form (the wings being hyaline in both sexes) from the same 

 locality near Constantino in which it was originally found by Lucas 

 more than fifty years ago. 



Sub-fam. AGEIONIN.E. 



Platycnemis subdilatata, Selys. — Constantino, June 12th, 

 1894 ; Biskra, May 20th, 1894 ; Oued Bou Sba, June 2nd, 1896 ; Le 

 Tarf, June 16th, 1896 ; Mines of Kef Oum Teboul, July 16th, 1896 ; 

 Lac Houbeira, July 11th, 1896. I have before me 12 ^^ and 4 ? , 



N.B. — The specimens indicated above vary very much. As in pennipes. Pall., 

 there are two main varieties, and evidently quite independent of locality or season. 

 But there is no blue variety of subdilatata ; the ground colour of this is whitish, 

 differing in the presence or absence of dark bands on the abdomen ; intermediate 

 conditions exist. Most, not all, of the females have no dark abdominal bands except 

 at the apex. I think it would be very diiEcult to separate the pale form of the (J of 

 pennipen from that o{ subdilatata if unaccompanied by the ? , and with no stated 

 locality, for I fail to realize the given character that the superior appendages in 

 subdilatata are more deeply bifid. 



