MTTILASPJ.S PINN^EFORMIS. 205 



Long. 1*75 2 mm. 



Adult female (PL XXV, fig. 10) white or yellowish. 

 Very elongate, narrowest in front, widest at first free 

 abdominal segment. Rudimentary antenna with one 

 or two stout curved hairs. Anterior parastigmatic 

 glands vary from 6 to 9 ; posterior groups absent, but a 

 little posterior to the spiracle is a group of 3 4. Four 

 free abdominal segments very pronounced, forming, 

 after treatment with potash, tuberculate projections, 

 each furnished with several short spines. Dermis 

 with tubular spinnerets as in M. pomorum. Py- 

 gidium (PL XXVI, fig. 1; PL XXVII, fig. 4) with 

 five groups of circumgenital glands; anterior group 

 arranged in a single concave series ; anterior laterals 

 usually forming a pyriform group ; posterior laterals 

 usually in a more or less circular group. 



Formula of six examples : 



675767 

 1214 . 1411 . 1312 . 1712 . 1212 . 119 



8 9 . 9 9 . 10 8 . 911 . 7 9 . 108 



Anus considerably above anterior grouped glands. 

 Vaginal opening immediately below the posterior 

 lateral groups. Subdorsal groups of tubular spin- 

 nerets occupying same position as in M. pomorum., but 

 shorter and a little more defined. Seven marginal 

 tubular spinnerets on each side of the centre, very large, 

 the first singly between the median and second lobes ; 

 the rest in pairs. Median lobes narrower, more at- 

 tenuated at the base than in M. pomorum; lateral 

 margins sloping and extending within the body- wall, 

 more irregularly dentate or bluntly serrate ; posterior 

 margin lobate ; second and third pairs of lobes, placed 

 together, have the posterior margin rounded, and some- 

 times with a faint lateral notch. Plates, one median 

 and four lateral pairs, are simple and spine-like. 

 Margin between the second and third pairs of lateral 

 plates distinctly but irregularly serrate. First mar- 

 ginal pore with a minute spine-like projection. 



